diff --git a/.gitignore b/.gitignore
index 30abf60fe..c1f903209 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,51 +1,52 @@
 .DS_Store
 
 node_modules
 
 landing/node_modules
 landing/dist
 
 lib/node_modules
 
 web/node_modules
 web/dist
 web/database/sqlite
 web/database/_generated/comm-query-executor.js.bak
 
 keyserver/dist
 keyserver/node_modules
 keyserver/addons/rust-node-addon/target
 keyserver/addons/rust-node-addon/napi
 keyserver/certs
 keyserver/secrets
 keyserver/facts
 keyserver/*.env
 keyserver/*.env.*
 keyserver/cpu_profiling_logs
 
 services/tunnelbroker/target
 services/tunnelbroker/src/libcpp/test/build
 
 .eslintcache
 .vscode
 !.vscode/extensions.json
 
 # CMake
 native/cpp/**/build
 services/*/build
 services/build
 services/lib/src/build
 shared/protos/build
 
 # Shared libraries
 shared/tunnelbroker-client/target
+shared/backup_client/target
 
 # Nix
 result*
 .direnv
 
 # Electron
 desktop/out/
 desktop/assets/
 desktop/dist/
 desktop/*.provisionprofile
diff --git a/services/commtest/Cargo.lock b/services/commtest/Cargo.lock
index 2cfda7446..79e5c57ba 100644
--- a/services/commtest/Cargo.lock
+++ b/services/commtest/Cargo.lock
@@ -1,2462 +1,2477 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
 version = 3
 
 [[package]]
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 [[package]]
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 dependencies = [
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 ]
 
+[[package]]
+name = "backup_client"
+version = "0.1.0"
+dependencies = [
+ "async-stream",
+ "comm-lib",
+ "derive_more",
+ "hex",
+ "reqwest",
+ "serde_json",
+ "sha2",
+ "url",
+]
+
 [[package]]
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 dependencies = [
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  "pin-project-lite",
  "rand",
  "slab",
  "tokio",
  "tokio-util",
  "tower-layer",
  "tower-service",
  "tracing",
 ]
 
 [[package]]
 name = "tower-layer"
 version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c20c8dbed6283a09604c3e69b4b7eeb54e298b8a600d4d5ecb5ad39de609f1d0"
 
 [[package]]
 name = "tower-service"
 version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b6bc1c9ce2b5135ac7f93c72918fc37feb872bdc6a5533a8b85eb4b86bfdae52"
 
 [[package]]
 name = "tracing"
 version = "0.1.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ce8c33a8d48bd45d624a6e523445fd21ec13d3653cd51f681abf67418f54eb8"
 dependencies = [
  "cfg-if",
  "pin-project-lite",
  "tracing-attributes",
  "tracing-core",
 ]
 
 [[package]]
 name = "tracing-attributes"
 version = "0.1.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5f4f31f56159e98206da9efd823404b79b6ef3143b4a7ab76e67b1751b25a4ab"
 dependencies = [
  "proc-macro2",
  "quote",
  "syn 2.0.29",
 ]
 
 [[package]]
 name = "tracing-core"
 version = "0.1.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0955b8137a1df6f1a2e9a37d8a6656291ff0297c1a97c24e0d8425fe2312f79a"
 dependencies = [
  "once_cell",
  "valuable",
 ]
 
 [[package]]
 name = "tracing-futures"
 version = "0.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "97d095ae15e245a057c8e8451bab9b3ee1e1f68e9ba2b4fbc18d0ac5237835f2"
 dependencies = [
  "pin-project",
  "tracing",
 ]
 
 [[package]]
 name = "tracing-log"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "78ddad33d2d10b1ed7eb9d1f518a5674713876e97e5bb9b7345a7984fbb4f922"
 dependencies = [
  "lazy_static",
  "log",
  "tracing-core",
 ]
 
 [[package]]
 name = "tracing-subscriber"
 version = "0.3.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "30a651bc37f915e81f087d86e62a18eec5f79550c7faff886f7090b4ea757c77"
 dependencies = [
  "matchers",
  "nu-ansi-term",
  "once_cell",
  "regex",
  "sharded-slab",
  "smallvec",
  "thread_local",
  "tracing",
  "tracing-core",
  "tracing-log",
 ]
 
 [[package]]
 name = "try-lock"
 version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3528ecfd12c466c6f163363caf2d02a71161dd5e1cc6ae7b34207ea2d42d81ed"
 
 [[package]]
 name = "tungstenite"
 version = "0.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "30ee6ab729cd4cf0fd55218530c4522ed30b7b6081752839b68fcec8d0960788"
 dependencies = [
  "base64 0.13.1",
  "byteorder",
  "bytes",
  "http",
  "httparse",
  "log",
  "rand",
  "sha1",
  "thiserror",
  "url",
  "utf-8",
 ]
 
 [[package]]
 name = "tunnelbroker_messages"
 version = "0.1.0"
 dependencies = [
  "serde",
  "serde_json",
 ]
 
 [[package]]
 name = "typenum"
 version = "1.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "497961ef93d974e23eb6f433eb5fe1b7930b659f06d12dec6fc44a8f554c0bba"
 
 [[package]]
 name = "unicase"
 version = "2.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f7d2d4dafb69621809a81864c9c1b864479e1235c0dd4e199924b9742439ed89"
 dependencies = [
  "version_check",
 ]
 
 [[package]]
 name = "unicode-bidi"
 version = "0.3.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "92888ba5573ff080736b3648696b70cafad7d250551175acbaa4e0385b3e1460"
 
 [[package]]
 name = "unicode-ident"
 version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "301abaae475aa91687eb82514b328ab47a211a533026cb25fc3e519b86adfc3c"
 
 [[package]]
 name = "unicode-normalization"
 version = "0.1.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5c5713f0fc4b5db668a2ac63cdb7bb4469d8c9fed047b1d0292cc7b0ce2ba921"
 dependencies = [
  "tinyvec",
 ]
 
 [[package]]
 name = "untrusted"
 version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a156c684c91ea7d62626509bce3cb4e1d9ed5c4d978f7b4352658f96a4c26b4a"
 
 [[package]]
 name = "url"
 version = "2.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "143b538f18257fac9cad154828a57c6bf5157e1aa604d4816b5995bf6de87ae5"
 dependencies = [
  "form_urlencoded",
  "idna",
  "percent-encoding",
 ]
 
 [[package]]
 name = "utf-8"
 version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "09cc8ee72d2a9becf2f2febe0205bbed8fc6615b7cb429ad062dc7b7ddd036a9"
 
 [[package]]
 name = "uuid"
 version = "1.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "79daa5ed5740825c40b389c5e50312b9c86df53fccd33f281df655642b43869d"
 dependencies = [
  "getrandom",
 ]
 
 [[package]]
 name = "valuable"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "830b7e5d4d90034032940e4ace0d9a9a057e7a45cd94e6c007832e39edb82f6d"
 
 [[package]]
 name = "vcpkg"
 version = "0.2.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "accd4ea62f7bb7a82fe23066fb0957d48ef677f6eeb8215f372f52e48bb32426"
 
 [[package]]
 name = "version_check"
 version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
 [[package]]
 name = "voprf"
 version = "0.4.0-pre.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "081acbe8fcf05d5e8e2aad8ef3d40e02eddeaec07c75a9770d862a0fc0874322"
 dependencies = [
  "curve25519-dalek",
  "derive-where",
  "digest 0.10.7",
  "displaydoc",
  "elliptic-curve",
  "generic-array",
  "rand_core",
  "serde",
  "sha2",
  "subtle",
  "zeroize",
 ]
 
 [[package]]
 name = "want"
 version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bfa7760aed19e106de2c7c0b581b509f2f25d3dacaf737cb82ac61bc6d760b0e"
 dependencies = [
  "try-lock",
 ]
 
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
 
 [[package]]
 name = "wasm-bindgen"
 version = "0.2.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7706a72ab36d8cb1f80ffbf0e071533974a60d0a308d01a5d0375bf60499a342"
 dependencies = [
  "cfg-if",
  "wasm-bindgen-macro",
 ]
 
 [[package]]
 name = "wasm-bindgen-backend"
 version = "0.2.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5ef2b6d3c510e9625e5fe6f509ab07d66a760f0885d858736483c32ed7809abd"
 dependencies = [
  "bumpalo",
  "log",
  "once_cell",
  "proc-macro2",
  "quote",
  "syn 2.0.29",
  "wasm-bindgen-shared",
 ]
 
 [[package]]
 name = "wasm-bindgen-futures"
 version = "0.4.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c02dbc21516f9f1f04f187958890d7e6026df8d16540b7ad9492bc34a67cea03"
 dependencies = [
  "cfg-if",
  "js-sys",
  "wasm-bindgen",
  "web-sys",
 ]
 
 [[package]]
 name = "wasm-bindgen-macro"
 version = "0.2.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dee495e55982a3bd48105a7b947fd2a9b4a8ae3010041b9e0faab3f9cd028f1d"
 dependencies = [
  "quote",
  "wasm-bindgen-macro-support",
 ]
 
 [[package]]
 name = "wasm-bindgen-macro-support"
 version = "0.2.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "54681b18a46765f095758388f2d0cf16eb8d4169b639ab575a8f5693af210c7b"
 dependencies = [
  "proc-macro2",
  "quote",
  "syn 2.0.29",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
 
 [[package]]
 name = "wasm-bindgen-shared"
 version = "0.2.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ca6ad05a4870b2bf5fe995117d3728437bd27d7cd5f06f13c17443ef369775a1"
 
 [[package]]
 name = "wasm-streams"
 version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b4609d447824375f43e1ffbc051b50ad8f4b3ae8219680c94452ea05eb240ac7"
 dependencies = [
  "futures-util",
  "js-sys",
  "wasm-bindgen",
  "wasm-bindgen-futures",
  "web-sys",
 ]
 
 [[package]]
 name = "web-sys"
 version = "0.3.64"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b85cbef8c220a6abc02aefd892dfc0fc23afb1c6a426316ec33253a3877249b"
 dependencies = [
  "js-sys",
  "wasm-bindgen",
 ]
 
 [[package]]
 name = "webpki-roots"
 version = "0.23.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b03058f88386e5ff5310d9111d53f48b17d732b401aeb83a8d5190f2ac459338"
 dependencies = [
  "rustls-webpki 0.100.3",
 ]
 
 [[package]]
 name = "which"
 version = "4.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2441c784c52b289a054b7201fc93253e288f094e2f4be9058343127c4226a269"
 dependencies = [
  "either",
  "libc",
  "once_cell",
 ]
 
 [[package]]
 name = "winapi"
 version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
 dependencies = [
  "winapi-i686-pc-windows-gnu",
  "winapi-x86_64-pc-windows-gnu",
 ]
 
 [[package]]
 name = "winapi-i686-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 
 [[package]]
 name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 
 [[package]]
 name = "windows"
 version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e686886bc078bc1b0b600cac0147aadb815089b6e4da64016cbd754b6342700f"
 dependencies = [
  "windows-targets",
 ]
 
 [[package]]
 name = "windows-sys"
 version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "677d2418bec65e3338edb076e806bc1ec15693c5d0104683f2efe857f61056a9"
 dependencies = [
  "windows-targets",
 ]
 
 [[package]]
 name = "windows-targets"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9a2fa6e2155d7247be68c096456083145c183cbbbc2764150dda45a87197940c"
 dependencies = [
  "windows_aarch64_gnullvm",
  "windows_aarch64_msvc",
  "windows_i686_gnu",
  "windows_i686_msvc",
  "windows_x86_64_gnu",
  "windows_x86_64_gnullvm",
  "windows_x86_64_msvc",
 ]
 
 [[package]]
 name = "windows_aarch64_gnullvm"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2b38e32f0abccf9987a4e3079dfb67dcd799fb61361e53e2882c3cbaf0d905d8"
 
 [[package]]
 name = "windows_aarch64_msvc"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dc35310971f3b2dbbf3f0690a219f40e2d9afcf64f9ab7cc1be722937c26b4bc"
 
 [[package]]
 name = "windows_i686_gnu"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a75915e7def60c94dcef72200b9a8e58e5091744960da64ec734a6c6e9b3743e"
 
 [[package]]
 name = "windows_i686_msvc"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8f55c233f70c4b27f66c523580f78f1004e8b5a8b659e05a4eb49d4166cca406"
 
 [[package]]
 name = "windows_x86_64_gnu"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "53d40abd2583d23e4718fddf1ebec84dbff8381c07cae67ff7768bbf19c6718e"
 
 [[package]]
 name = "windows_x86_64_gnullvm"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b7b52767868a23d5bab768e390dc5f5c55825b6d30b86c844ff2dc7414044cc"
 
 [[package]]
 name = "windows_x86_64_msvc"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
 
 [[package]]
 name = "winreg"
 version = "0.50.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "524e57b2c537c0f9b1e69f1965311ec12182b4122e45035b1508cd24d2adadb1"
 dependencies = [
  "cfg-if",
  "windows-sys",
 ]
 
 [[package]]
 name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
 dependencies = [
  "zeroize_derive",
 ]
 
 [[package]]
 name = "zeroize_derive"
 version = "1.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
 dependencies = [
  "proc-macro2",
  "quote",
  "syn 2.0.29",
 ]
diff --git a/services/commtest/Cargo.toml b/services/commtest/Cargo.toml
index 478df8b94..5af08eb91 100644
--- a/services/commtest/Cargo.toml
+++ b/services/commtest/Cargo.toml
@@ -1,32 +1,33 @@
 [package]
 name = "commtest"
 version = "0.1.0"
 edition = "2021"
 license = "BSD-3-Clause"
 
 [dependencies]
 comm-opaque2 = { path = "../../shared/comm-opaque2" }
 grpc_clients = { path = "../../shared/grpc_clients" }
+backup_client = { path = "../../shared/backup_client" }
 tonic = "0.8"
 tokio = { version = "1.24", features = ["macros", "rt-multi-thread"] }
 prost = "0.11"
 async-stream = "0.3.2"
 derive_more = "0.99.16"
 bytesize = "1.1.0"
 lazy_static = "1.4.0"
 num_cpus = "1.13.1"
 sha2 = "0.10.2"
 hex = "0.4.3"
 tokio-tungstenite = "0.18.0"
 tunnelbroker_messages = { path = "../../shared/tunnelbroker_messages" }
 url = "2.3.1"
 futures-util = "0.3.28"
 serde_json = "1.0.96"
 rand = "0.8.5"
 reqwest = { version = "0.11", features = ["json", "multipart", "stream"] }
 serde = "1.0"
 comm-lib = { path = "../../shared/comm-lib" }
 uuid = { version = "1.2", features = ["v4"] }
 
 [build-dependencies]
 tonic-build = "0.8"
diff --git a/services/commtest/src/backup/backup_utils.rs b/services/commtest/src/backup/backup_utils.rs
deleted file mode 100644
index 0f9111396..000000000
--- a/services/commtest/src/backup/backup_utils.rs
+++ /dev/null
@@ -1,9 +0,0 @@
-#[derive(Debug, Clone)]
-pub struct BackupData {
-  pub backup_id: String,
-  pub user_keys_hash: String,
-  pub user_keys: Vec<u8>,
-  pub user_data_hash: String,
-  pub user_data: Vec<u8>,
-  pub attachments: Vec<String>,
-}
diff --git a/services/commtest/src/backup/create_new_backup.rs b/services/commtest/src/backup/create_new_backup.rs
deleted file mode 100644
index ae49cf663..000000000
--- a/services/commtest/src/backup/create_new_backup.rs
+++ /dev/null
@@ -1,60 +0,0 @@
-use std::convert::Infallible;
-
-use crate::tools::Error;
-use async_stream::stream;
-use comm_lib::auth::UserIdentity;
-use reqwest::{
-  multipart::{Form, Part},
-  Body,
-};
-
-use super::backup_utils::BackupData;
-
-pub async fn run(
-  url: reqwest::Url,
-  user_identity: &UserIdentity,
-  backup_data: &BackupData,
-) -> Result<(), Error> {
-  println!("Creating new backup");
-
-  let BackupData {
-    backup_id,
-    user_keys_hash,
-    user_keys,
-    user_data_hash,
-    user_data,
-    attachments,
-  } = backup_data.clone();
-
-  let client = reqwest::Client::new();
-  let form = Form::new()
-    .text("backup_id", backup_id)
-    .text("user_keys_hash", user_keys_hash)
-    .part(
-      "user_keys",
-      Part::stream(Body::wrap_stream(
-        stream! { yield Ok::<Vec<u8>, Infallible>(user_keys);  },
-      )),
-    )
-    .text("user_data_hash", user_data_hash)
-    .part(
-      "user_data",
-      Part::stream(Body::wrap_stream(
-        stream! { yield Ok::<Vec<u8>, Infallible>(user_data);  },
-      )),
-    )
-    .text("attachments", attachments.join("\n"));
-
-  let response = client
-    .post(url.join("backups")?)
-    .bearer_auth(user_identity.as_authorization_token()?)
-    .multipart(form)
-    .send()
-    .await?;
-
-  if !response.status().is_success() {
-    return Err(Error::HttpStatus(response.status()));
-  }
-
-  Ok(())
-}
diff --git a/services/commtest/src/backup/mod.rs b/services/commtest/src/backup/mod.rs
deleted file mode 100644
index 8ddf1f796..000000000
--- a/services/commtest/src/backup/mod.rs
+++ /dev/null
@@ -1,3 +0,0 @@
-pub mod backup_utils;
-pub mod create_new_backup;
-pub mod pull_backup;
diff --git a/services/commtest/src/backup/pull_backup.rs b/services/commtest/src/backup/pull_backup.rs
deleted file mode 100644
index a92d83817..000000000
--- a/services/commtest/src/backup/pull_backup.rs
+++ /dev/null
@@ -1,80 +0,0 @@
-use std::fmt::Display;
-
-use crate::tools::Error;
-use comm_lib::auth::UserIdentity;
-
-#[derive(Debug, Clone)]
-pub enum BackupDescriptor {
-  BackupID {
-    backup_id: String,
-    user_identity: UserIdentity,
-  },
-  Latest {
-    username: String,
-  },
-}
-
-impl Display for BackupDescriptor {
-  fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-    match self {
-      BackupDescriptor::BackupID {
-        backup_id,
-        user_identity,
-      } => write!(
-        f,
-        "backup '{backup_id}' for user '{}'",
-        user_identity.user_id
-      ),
-      BackupDescriptor::Latest { username } => {
-        write!(f, "latest backup for user '{username}'")
-      }
-    }
-  }
-}
-
-#[derive(Debug, Clone, Copy)]
-pub enum RequestedData {
-  BackupID,
-  UserKeys,
-  UserData,
-}
-
-pub async fn run(
-  url: reqwest::Url,
-  backup_descriptor: BackupDescriptor,
-  requested_data: RequestedData,
-) -> Result<Vec<u8>, Error> {
-  println!("Pulling data: {requested_data:?}, from {backup_descriptor}");
-
-  let client = reqwest::Client::new();
-  let url = url.join("backups/")?;
-  let url = match &backup_descriptor {
-    BackupDescriptor::BackupID { backup_id, .. } => {
-      url.join(&format!("{backup_id}/"))?
-    }
-    BackupDescriptor::Latest { username } => {
-      url.join(&format!("latest/{username}/"))?
-    }
-  };
-  let url = match &requested_data {
-    RequestedData::BackupID => url.join("backup_id")?,
-    RequestedData::UserKeys => url.join("user_keys")?,
-    RequestedData::UserData => url.join("user_data")?,
-  };
-
-  let mut request = client.get(url);
-
-  if let BackupDescriptor::BackupID { user_identity, .. } = backup_descriptor {
-    request = request.bearer_auth(user_identity.as_authorization_token()?)
-  }
-
-  let response = request.send().await?;
-
-  if !response.status().is_success() {
-    return Err(Error::HttpStatus(response.status()));
-  }
-
-  let result = response.bytes().await?.to_vec();
-
-  Ok(result)
-}
diff --git a/services/commtest/src/lib.rs b/services/commtest/src/lib.rs
index 1b6efef9c..e4f84fa23 100644
--- a/services/commtest/src/lib.rs
+++ b/services/commtest/src/lib.rs
@@ -1,7 +1,6 @@
-pub mod backup;
 pub mod blob;
 pub mod constants;
 pub mod identity;
 pub mod service_addr;
 pub mod tools;
 pub mod tunnelbroker;
diff --git a/services/commtest/src/tools.rs b/services/commtest/src/tools.rs
index 642bb431e..5fc68e786 100644
--- a/services/commtest/src/tools.rs
+++ b/services/commtest/src/tools.rs
@@ -1,70 +1,72 @@
 use hex::ToHex;
 use num_cpus;
 use sha2::{Digest, Sha512};
 use std::env;
 use url::ParseError;
 
 pub fn generate_stable_nbytes(
   number_of_bytes: usize,
   predefined_byte_value: Option<u8>,
 ) -> Vec<u8> {
   let byte_value = predefined_byte_value.unwrap_or(b'A');
   vec![byte_value; number_of_bytes]
 }
 
 #[derive(
   Debug, derive_more::Display, derive_more::From, derive_more::Error,
 )]
 pub enum Error {
   #[display(...)]
   Proto(std::io::Error),
   #[display(...)]
   Tonic(tonic::transport::Error),
   #[display(...)]
   TonicStatus(tonic::Status),
   #[display(...)]
   Reqwest(reqwest::Error),
   #[display(fmt = "HTTP status: {:?}.", _0)]
   HttpStatus(#[error(ignore)] reqwest::StatusCode),
   #[display(...)]
   ParseError(ParseError),
   #[display(...)]
   JsonError(serde_json::error::Error),
   #[display(...)]
   FromUtf8Error(std::string::FromUtf8Error),
+  #[display(...)]
+  BackupClientError(backup_client::Error),
 }
 
 pub fn obtain_number_of_threads() -> usize {
   let number_of_threads_str: String =
     env::var("COMM_NUMBER_OF_THREADS").unwrap();
   if number_of_threads_str.is_empty() {
     return num_cpus::get();
   }
   number_of_threads_str.parse::<usize>().unwrap()
 }
 
 pub struct DataHasher {
   hasher: Sha512,
 }
 
 impl DataHasher {
   pub fn new() -> DataHasher {
     DataHasher {
       hasher: Sha512::new(),
     }
   }
 
   pub fn update(data_hasher: &mut DataHasher, bytes: Vec<u8>) {
     data_hasher.hasher.update(bytes);
   }
   pub fn get_hash(self) -> String {
     let hash = self.hasher.finalize();
     hash.encode_hex::<String>()
   }
 }
 
 impl Default for DataHasher {
   fn default() -> Self {
     Self::new()
   }
 }
diff --git a/services/commtest/tests/backup_integration_test.rs b/services/commtest/tests/backup_integration_test.rs
index 481039169..8555737c9 100644
--- a/services/commtest/tests/backup_integration_test.rs
+++ b/services/commtest/tests/backup_integration_test.rs
@@ -1,123 +1,112 @@
+use backup_client::{
+  BackupClient, BackupData, BackupDescriptor, Error as BackupClientError,
+  RequestedData,
+};
 use bytesize::ByteSize;
 use comm_lib::{auth::UserIdentity, backup::LatestBackupIDResponse};
 use commtest::{
-  backup::{
-    backup_utils::BackupData,
-    create_new_backup,
-    pull_backup::{self, BackupDescriptor, RequestedData},
-  },
   service_addr,
   tools::{generate_stable_nbytes, Error},
 };
 use reqwest::StatusCode;
 
 #[tokio::test]
 async fn backup_integration_test() -> Result<(), Error> {
-  let url = reqwest::Url::try_from(service_addr::BACKUP_SERVICE_HTTP)
-    .expect("failed to parse backup service url");
+  let backup_client = BackupClient::new(service_addr::BACKUP_SERVICE_HTTP)?;
 
   let backup_datas = [
     BackupData {
       backup_id: "b1".to_string(),
-      user_keys_hash: "kh1".to_string(),
       user_keys: generate_stable_nbytes(
         ByteSize::kib(4).as_u64() as usize,
         Some(b'a'),
       ),
-      user_data_hash: "dh1".to_string(),
       user_data: generate_stable_nbytes(
         ByteSize::mib(4).as_u64() as usize,
         Some(b'A'),
       ),
       attachments: vec![],
     },
     BackupData {
       backup_id: "b2".to_string(),
-      user_keys_hash: "kh2".to_string(),
       user_keys: generate_stable_nbytes(
         ByteSize::kib(4).as_u64() as usize,
         Some(b'b'),
       ),
-      user_data_hash: "dh2".to_string(),
       user_data: generate_stable_nbytes(
         ByteSize::mib(4).as_u64() as usize,
         Some(b'B'),
       ),
       attachments: vec![],
     },
   ];
 
   let user_identity = UserIdentity {
     user_id: "1".to_string(),
     access_token: "dummy access token".to_string(),
     device_id: "dummy device_id".to_string(),
   };
 
-  create_new_backup::run(url.clone(), &user_identity, &backup_datas[0]).await?;
-  create_new_backup::run(url.clone(), &user_identity, &backup_datas[1]).await?;
+  backup_client
+    .upload_backup(&user_identity, backup_datas[0].clone())
+    .await?;
+  backup_client
+    .upload_backup(&user_identity, backup_datas[1].clone())
+    .await?;
 
   // Test direct lookup
   let second_backup_descriptor = BackupDescriptor::BackupID {
     backup_id: backup_datas[1].backup_id.clone(),
     user_identity: user_identity.clone(),
   };
 
-  let user_keys = pull_backup::run(
-    url.clone(),
-    second_backup_descriptor.clone(),
-    RequestedData::UserKeys,
-  )
-  .await?;
+  let user_keys = backup_client
+    .download_backup_data(&second_backup_descriptor, RequestedData::UserKeys)
+    .await?;
   assert_eq!(user_keys, backup_datas[1].user_keys);
 
-  let user_data = pull_backup::run(
-    url.clone(),
-    second_backup_descriptor.clone(),
-    RequestedData::UserData,
-  )
-  .await?;
+  let user_data = backup_client
+    .download_backup_data(&second_backup_descriptor, RequestedData::UserData)
+    .await?;
   assert_eq!(user_data, backup_datas[1].user_data);
 
   // Test latest backup lookup
   let latest_backup_descriptor = BackupDescriptor::Latest {
     // Initial version of the backup service uses `user_id` in place of a username
     username: "1".to_string(),
   };
 
-  let backup_id_response = pull_backup::run(
-    url.clone(),
-    latest_backup_descriptor.clone(),
-    RequestedData::BackupID,
-  )
-  .await?;
+  let backup_id_response = backup_client
+    .download_backup_data(&latest_backup_descriptor, RequestedData::BackupID)
+    .await?;
   let response: LatestBackupIDResponse =
     serde_json::from_slice(&backup_id_response)?;
   assert_eq!(response.backup_id, backup_datas[1].backup_id);
 
-  let user_keys = pull_backup::run(
-    url.clone(),
-    latest_backup_descriptor.clone(),
-    RequestedData::UserKeys,
-  )
-  .await?;
+  let user_keys = backup_client
+    .download_backup_data(&latest_backup_descriptor, RequestedData::UserKeys)
+    .await?;
   assert_eq!(user_keys, backup_datas[1].user_keys);
 
   // Test cleanup
   let first_backup_descriptor = BackupDescriptor::BackupID {
     backup_id: backup_datas[0].backup_id.clone(),
     user_identity: user_identity.clone(),
   };
 
-  let response = pull_backup::run(
-    url.clone(),
-    first_backup_descriptor.clone(),
-    RequestedData::UserKeys,
-  )
-  .await;
-  assert!(
-    matches!(response, Err(Error::HttpStatus(StatusCode::NOT_FOUND))),
-    "First backup should have been removed, instead got response: {response:?}"
+  let response = backup_client
+    .download_backup_data(&first_backup_descriptor, RequestedData::UserKeys)
+    .await;
+
+  let Err(BackupClientError::ReqwestError(error)) = response else {
+    panic!("First backup should have been removed, instead got response: {response:?}");
+  };
+
+  assert_eq!(
+    error.status(),
+    Some(StatusCode::NOT_FOUND),
+    "Expected status 'not found'"
   );
 
   Ok(())
 }
diff --git a/services/commtest/tests/backup_performance_test.rs b/services/commtest/tests/backup_performance_test.rs
index 5973ae44c..f60a226ee 100644
--- a/services/commtest/tests/backup_performance_test.rs
+++ b/services/commtest/tests/backup_performance_test.rs
@@ -1,185 +1,171 @@
+use backup_client::{
+  BackupClient, BackupData, BackupDescriptor, RequestedData,
+};
 use bytesize::ByteSize;
 use comm_lib::{auth::UserIdentity, backup::LatestBackupIDResponse};
 use commtest::{
-  backup::{
-    backup_utils::BackupData,
-    create_new_backup,
-    pull_backup::{self, BackupDescriptor},
-  },
   service_addr,
   tools::{generate_stable_nbytes, obtain_number_of_threads, Error},
 };
 use tokio::{runtime::Runtime, task::JoinSet};
 
 #[tokio::test]
 async fn backup_performance_test() -> Result<(), Error> {
-  let url = reqwest::Url::try_from(service_addr::BACKUP_SERVICE_HTTP)
-    .expect("failed to parse backup service url");
+  let backup_client = BackupClient::new(service_addr::BACKUP_SERVICE_HTTP)?;
 
   let number_of_threads = obtain_number_of_threads();
 
   let rt = Runtime::new().unwrap();
 
   println!(
     "Running performance tests for backup, number of threads: {}",
     number_of_threads
   );
 
   let mut backup_data = vec![];
   for i in 0..number_of_threads {
     backup_data.push(BackupData {
       backup_id: format!("b{i}"),
-      user_keys_hash: format!("kh{i}"),
       user_keys: generate_stable_nbytes(
         ByteSize::kib(4).as_u64() as usize,
         Some(i as u8),
       ),
-      user_data_hash: format!("dh{i}"),
       user_data: generate_stable_nbytes(
         ByteSize::mib(4).as_u64() as usize,
         Some(i as u8),
       ),
       attachments: vec![],
     });
   }
 
   let user_identities = [
     UserIdentity {
       user_id: "1".to_string(),
       access_token: "dummy access token".to_string(),
       device_id: "dummy device_id".to_string(),
     },
     UserIdentity {
       user_id: "2".to_string(),
       access_token: "dummy access token".to_string(),
       device_id: "dummy device_id".to_string(),
     },
   ];
 
   tokio::task::spawn_blocking(move || {
     println!("Creating new backups");
     rt.block_on(async {
       let mut set = JoinSet::new();
-      for (i, item) in backup_data.iter().enumerate() {
-        let url = url.clone();
+      for (i, item) in backup_data.iter().cloned().enumerate() {
+        let backup_client = backup_client.clone();
         let user = user_identities[i % user_identities.len()].clone();
-        let item = item.clone();
+
         set.spawn(async move {
-          create_new_backup::run(url, &user, &item).await.unwrap();
+          backup_client.upload_backup(&user, item).await.unwrap();
         });
       }
 
       while let Some(result) = set.join_next().await {
         result.unwrap();
       }
     });
 
     let mut latest_ids_for_user = vec![];
     println!("Reading latest ids");
     rt.block_on(async {
       let mut handlers = vec![];
       for user in &user_identities {
-        let url = url.clone();
+        let backup_client = backup_client.clone();
         let descriptor = BackupDescriptor::Latest {
           username: user.user_id.clone(),
         };
         handlers.push(tokio::spawn(async move {
-          let response = pull_backup::run(
-            url,
-            descriptor,
-            pull_backup::RequestedData::BackupID,
-          )
-          .await
-          .unwrap();
+          let response = backup_client
+            .download_backup_data(&descriptor, RequestedData::BackupID)
+            .await
+            .unwrap();
 
           serde_json::from_slice::<LatestBackupIDResponse>(&response).unwrap()
         }));
       }
 
       for handler in handlers {
         latest_ids_for_user.push(handler.await.unwrap().backup_id);
       }
     });
 
     assert_eq!(latest_ids_for_user.len(), user_identities.len());
 
     let mut latest_user_keys_for_user = vec![];
     println!("Reading latest user keys");
     rt.block_on(async {
       let mut handlers = vec![];
       for user in &user_identities {
-        let url = url.clone();
+        let backup_client = backup_client.clone();
         let descriptor = BackupDescriptor::Latest {
           username: user.user_id.clone(),
         };
         handlers.push(tokio::spawn(async move {
-          pull_backup::run(
-            url,
-            descriptor,
-            pull_backup::RequestedData::UserKeys,
-          )
-          .await
-          .unwrap()
+          backup_client
+            .download_backup_data(&descriptor, RequestedData::UserKeys)
+            .await
+            .unwrap()
         }));
       }
 
       for handler in handlers {
         latest_user_keys_for_user.push(handler.await.unwrap());
       }
     });
 
     assert_eq!(latest_user_keys_for_user.len(), user_identities.len());
     for (backup_id, user_keys) in
       latest_ids_for_user.iter().zip(latest_user_keys_for_user)
     {
       let backup = backup_data
         .iter()
         .find(|data| data.backup_id == *backup_id)
         .expect("Request should return existing backup data");
 
       assert_eq!(backup.user_keys, user_keys);
     }
 
     let mut latest_user_data_for_user = vec![];
     println!("Reading latest user data");
     rt.block_on(async {
       let mut handlers = vec![];
       for (i, backup_id) in latest_ids_for_user.iter().enumerate() {
-        let url = url.clone();
+        let backup_client = backup_client.clone();
         let descriptor = BackupDescriptor::BackupID {
           backup_id: backup_id.clone(),
           user_identity: user_identities[i % user_identities.len()].clone(),
         };
         handlers.push(tokio::spawn(async move {
-          pull_backup::run(
-            url,
-            descriptor,
-            pull_backup::RequestedData::UserData,
-          )
-          .await
-          .unwrap()
+          backup_client
+            .download_backup_data(&descriptor, RequestedData::UserData)
+            .await
+            .unwrap()
         }));
       }
 
       for handler in handlers {
         latest_user_data_for_user.push(handler.await.unwrap());
       }
     });
 
     assert_eq!(latest_user_data_for_user.len(), user_identities.len());
     for (backup_id, user_data) in
       latest_ids_for_user.iter().zip(latest_user_data_for_user)
     {
       let backup = backup_data
         .iter()
         .find(|data| data.backup_id == *backup_id)
         .expect("Request should return existing backup data");
 
       assert_eq!(backup.user_data, user_data);
     }
   })
   .await
   .expect("Task panicked");
 
   Ok(())
 }
diff --git a/services/commtest/Cargo.lock b/shared/backup_client/Cargo.lock
similarity index 69%
copy from services/commtest/Cargo.lock
copy to shared/backup_client/Cargo.lock
index 2cfda7446..882132c29 100644
--- a/services/commtest/Cargo.lock
+++ b/shared/backup_client/Cargo.lock
@@ -1,2462 +1,2096 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
 version = 3
 
 [[package]]
 name = "addr2line"
 version = "0.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8a30b2e23b9e17a9f90641c7ab1549cd9b44f296d3ccbf309d2863cfe398a0cb"
 dependencies = [
  "gimli",
 ]
 
 [[package]]
 name = "adler"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
 
 [[package]]
 name = "aho-corasick"
-version = "1.0.5"
+version = "1.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c378d78423fdad8089616f827526ee33c19f2fddbd5de1629152c9593ba4783"
+checksum = "b2969dcb958b36655471fc61f7e416fa76033bdd4bfed0678d8fee1e2d07a1f0"
 dependencies = [
  "memchr",
 ]
 
 [[package]]
 name = "android-tzdata"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e999941b234f3131b00bc13c22d06e8c5ff726d1b6318ac7eb276997bbb4fef0"
 
 [[package]]
 name = "android_system_properties"
 version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
 dependencies = [
  "libc",
 ]
 
 [[package]]
 name = "anyhow"
 version = "1.0.75"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a4668cab20f66d8d020e1fbc0ebe47217433c1b6c8f2040faf858554e394ace6"
 
-[[package]]
-name = "argon2"
-version = "0.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "db4ce4441f99dbd377ca8a8f57b698c44d0d6e712d8329b5040da5a64aa1ce73"
-dependencies = [
- "base64ct",
- "blake2",
- "password-hash",
-]
-
 [[package]]
 name = "async-stream"
 version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cd56dd203fef61ac097dd65721a419ddccb106b2d2b70ba60a6b529f03961a51"
 dependencies = [
  "async-stream-impl",
  "futures-core",
  "pin-project-lite",
 ]
 
 [[package]]
 name = "async-stream-impl"
 version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "16e62a023e7c117e27523144c5d2459f4397fcc3cab0085af8e2224f643a0193"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.39",
 ]
 
 [[package]]
 name = "async-trait"
-version = "0.1.73"
+version = "0.1.74"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bc00ceb34980c03614e35a3a4e218276a0a824e911d07651cd0d858a51e8c0f0"
+checksum = "a66537f1bb974b254c98ed142ff995236e81b9d0fe4db0575f46612cb15eb0f9"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.29",
+ "syn 2.0.39",
 ]
 
 [[package]]
 name = "autocfg"
 version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
 [[package]]
 name = "axum"
 version = "0.6.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3b829e4e32b91e643de6eafe82b1d90675f5874230191a4ffbc1b336dec4d6bf"
 dependencies = [
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  "axum-core",
  "bitflags 1.3.2",
  "bytes",
  "futures-util",
  "http",
  "http-body",
  "hyper",
  "itoa",
  "matchit",
  "memchr",
  "mime",
  "percent-encoding",
  "pin-project-lite",
  "rustversion",
  "serde",
  "sync_wrapper",
  "tower",
  "tower-layer",
  "tower-service",
 ]
 
 [[package]]
 name = "axum-core"
 version = "0.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "759fa577a247914fd3f7f76d62972792636412fbfd634cd452f6a385a74d2d2c"
 dependencies = [
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  "bytes",
  "futures-util",
  "http",
  "http-body",
  "mime",
  "rustversion",
  "tower-layer",
  "tower-service",
 ]
 
 [[package]]
 name = "backtrace"
 version = "0.3.69"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2089b7e3f35b9dd2d0ed921ead4f6d318c27680d4a5bd167b3ee120edb105837"
 dependencies = [
  "addr2line",
  "cc",
  "cfg-if",
  "libc",
  "miniz_oxide",
  "object",
  "rustc-demangle",
 ]
 
 [[package]]
-name = "base16ct"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "349a06037c7bf932dd7e7d1f653678b2038b9ad46a74102f1fc7bd7872678cce"
-
-[[package]]
-name = "base64"
-version = "0.13.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9e1b586273c5702936fe7b7d6896644d8be71e6314cfe09d3167c95f712589e8"
+name = "backup_client"
+version = "0.1.0"
+dependencies = [
+ "async-stream",
+ "comm-lib",
+ "derive_more",
+ "hex",
+ "reqwest",
+ "serde_json",
+ "sha2",
+ "url",
+]
 
 [[package]]
 name = "base64"
-version = "0.21.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "414dcefbc63d77c526a76b3afcf6fbb9b5e2791c19c3aa2297733208750c6e53"
-
-[[package]]
-name = "base64ct"
-version = "1.6.0"
+version = "0.21.5"
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 [[package]]
-name = "windows"
-version = "0.48.0"
+name = "windows-core"
+version = "0.51.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e686886bc078bc1b0b600cac0147aadb815089b6e4da64016cbd754b6342700f"
+checksum = "f1f8cf84f35d2db49a46868f947758c7a1138116f7fac3bc844f43ade1292e64"
 dependencies = [
- "windows-targets",
+ "windows-targets 0.48.5",
 ]
 
 [[package]]
 name = "windows-sys"
 version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "677d2418bec65e3338edb076e806bc1ec15693c5d0104683f2efe857f61056a9"
 dependencies = [
- "windows-targets",
+ "windows-targets 0.48.5",
+]
+
+[[package]]
+name = "windows-sys"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
+dependencies = [
+ "windows-targets 0.52.0",
 ]
 
 [[package]]
 name = "windows-targets"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9a2fa6e2155d7247be68c096456083145c183cbbbc2764150dda45a87197940c"
 dependencies = [
- "windows_aarch64_gnullvm",
- "windows_aarch64_msvc",
- "windows_i686_gnu",
- "windows_i686_msvc",
- "windows_x86_64_gnu",
- "windows_x86_64_gnullvm",
- "windows_x86_64_msvc",
+ "windows_aarch64_gnullvm 0.48.5",
+ "windows_aarch64_msvc 0.48.5",
+ "windows_i686_gnu 0.48.5",
+ "windows_i686_msvc 0.48.5",
+ "windows_x86_64_gnu 0.48.5",
+ "windows_x86_64_gnullvm 0.48.5",
+ "windows_x86_64_msvc 0.48.5",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a18201040b24831fbb9e4eb208f8892e1f50a37feb53cc7ff887feb8f50e7cd"
+dependencies = [
+ "windows_aarch64_gnullvm 0.52.0",
+ "windows_aarch64_msvc 0.52.0",
+ "windows_i686_gnu 0.52.0",
+ "windows_i686_msvc 0.52.0",
+ "windows_x86_64_gnu 0.52.0",
+ "windows_x86_64_gnullvm 0.52.0",
+ "windows_x86_64_msvc 0.52.0",
 ]
 
 [[package]]
 name = "windows_aarch64_gnullvm"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2b38e32f0abccf9987a4e3079dfb67dcd799fb61361e53e2882c3cbaf0d905d8"
 
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cb7764e35d4db8a7921e09562a0304bf2f93e0a51bfccee0bd0bb0b666b015ea"
+
 [[package]]
 name = "windows_aarch64_msvc"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dc35310971f3b2dbbf3f0690a219f40e2d9afcf64f9ab7cc1be722937c26b4bc"
 
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bbaa0368d4f1d2aaefc55b6fcfee13f41544ddf36801e793edbbfd7d7df075ef"
+
 [[package]]
 name = "windows_i686_gnu"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a75915e7def60c94dcef72200b9a8e58e5091744960da64ec734a6c6e9b3743e"
 
+[[package]]
+name = "windows_i686_gnu"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a28637cb1fa3560a16915793afb20081aba2c92ee8af57b4d5f28e4b3e7df313"
+
 [[package]]
 name = "windows_i686_msvc"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8f55c233f70c4b27f66c523580f78f1004e8b5a8b659e05a4eb49d4166cca406"
 
+[[package]]
+name = "windows_i686_msvc"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ffe5e8e31046ce6230cc7215707b816e339ff4d4d67c65dffa206fd0f7aa7b9a"
+
 [[package]]
 name = "windows_x86_64_gnu"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "53d40abd2583d23e4718fddf1ebec84dbff8381c07cae67ff7768bbf19c6718e"
 
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3d6fa32db2bc4a2f5abeacf2b69f7992cd09dca97498da74a151a3132c26befd"
+
 [[package]]
 name = "windows_x86_64_gnullvm"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b7b52767868a23d5bab768e390dc5f5c55825b6d30b86c844ff2dc7414044cc"
 
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a657e1e9d3f514745a572a6846d3c7aa7dbe1658c056ed9c3344c4109a6949e"
+
 [[package]]
 name = "windows_x86_64_msvc"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
 
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dff9641d1cd4be8d1a070daf9e3773c5f67e78b4d9d42263020c057706765c04"
+
 [[package]]
 name = "winreg"
 version = "0.50.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "524e57b2c537c0f9b1e69f1965311ec12182b4122e45035b1508cd24d2adadb1"
 dependencies = [
  "cfg-if",
- "windows-sys",
-]
-
-[[package]]
-name = "zeroize"
-version = "1.6.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
-dependencies = [
- "zeroize_derive",
-]
-
-[[package]]
-name = "zeroize_derive"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.29",
+ "windows-sys 0.48.0",
 ]
diff --git a/shared/backup_client/Cargo.toml b/shared/backup_client/Cargo.toml
new file mode 100644
index 000000000..0c5340b7f
--- /dev/null
+++ b/shared/backup_client/Cargo.toml
@@ -0,0 +1,22 @@
+[package]
+name = "backup_client"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+comm-lib = { path = "../comm-lib" }
+reqwest = { version = "0.11", default-features = false, features = [
+  "multipart",
+  "stream",
+] }
+url = "2.3.1"
+derive_more = "0.99"
+serde_json = { version = "1.0" }
+async-stream = "0.3.2"
+sha2 = "0.10"
+hex = "0.4.3"
+
+[features]
+default = ["native-tls"]
+native-tls = ["reqwest/native-tls"]
+rustls-tls = ["reqwest/rustls-tls"]
diff --git a/shared/backup_client/src/lib.rs b/shared/backup_client/src/lib.rs
new file mode 100644
index 000000000..49d57dd23
--- /dev/null
+++ b/shared/backup_client/src/lib.rs
@@ -0,0 +1,130 @@
+pub use comm_lib::auth::UserIdentity;
+pub use comm_lib::backup::LatestBackupIDResponse;
+use hex::ToHex;
+use reqwest::{
+  multipart::{Form, Part},
+  Body,
+};
+use sha2::{Digest, Sha256};
+
+#[derive(Debug, Clone)]
+pub struct BackupClient {
+  url: reqwest::Url,
+}
+
+impl BackupClient {
+  pub fn new<T: TryInto<reqwest::Url>>(url: T) -> Result<Self, T::Error> {
+    Ok(BackupClient {
+      url: url.try_into()?,
+    })
+  }
+
+  pub async fn upload_backup(
+    &self,
+    user_identity: &UserIdentity,
+    backup_data: BackupData,
+  ) -> Result<(), Error> {
+    let BackupData {
+      backup_id,
+      user_keys,
+      user_data,
+      attachments,
+    } = backup_data;
+
+    let client = reqwest::Client::new();
+    let form = Form::new()
+      .text("backup_id", backup_id)
+      .text(
+        "user_keys_hash",
+        Sha256::digest(&user_keys).encode_hex::<String>(),
+      )
+      .part("user_keys", Part::stream(Body::from(user_keys)))
+      .text(
+        "user_data_hash",
+        Sha256::digest(&user_data).encode_hex::<String>(),
+      )
+      .part("user_data", Part::stream(Body::from(user_data)))
+      .text("attachments", attachments.join("\n"));
+
+    let response = client
+      .post(self.url.join("backups")?)
+      .bearer_auth(user_identity.as_authorization_token()?)
+      .multipart(form)
+      .send()
+      .await?;
+
+    response.error_for_status()?;
+
+    Ok(())
+  }
+
+  pub async fn download_backup_data(
+    &self,
+    backup_descriptor: &BackupDescriptor,
+    requested_data: RequestedData,
+  ) -> Result<Vec<u8>, Error> {
+    let client = reqwest::Client::new();
+    let url = self.url.join("backups/")?;
+    let url = match backup_descriptor {
+      BackupDescriptor::BackupID { backup_id, .. } => {
+        url.join(&format!("{backup_id}/"))?
+      }
+      BackupDescriptor::Latest { username } => {
+        url.join(&format!("latest/{username}/"))?
+      }
+    };
+    let url = match &requested_data {
+      RequestedData::BackupID => url.join("backup_id")?,
+      RequestedData::UserKeys => url.join("user_keys")?,
+      RequestedData::UserData => url.join("user_data")?,
+    };
+
+    let mut request = client.get(url);
+
+    if let BackupDescriptor::BackupID { user_identity, .. } = backup_descriptor
+    {
+      request = request.bearer_auth(user_identity.as_authorization_token()?)
+    }
+
+    let response = request.send().await?;
+
+    let result = response.error_for_status()?.bytes().await?.to_vec();
+
+    Ok(result)
+  }
+}
+
+#[derive(Debug, Clone)]
+pub struct BackupData {
+  pub backup_id: String,
+  pub user_keys: Vec<u8>,
+  pub user_data: Vec<u8>,
+  pub attachments: Vec<String>,
+}
+
+#[derive(Debug, Clone)]
+pub enum BackupDescriptor {
+  BackupID {
+    backup_id: String,
+    user_identity: UserIdentity,
+  },
+  Latest {
+    username: String,
+  },
+}
+
+#[derive(Debug, Clone, Copy)]
+pub enum RequestedData {
+  BackupID,
+  UserKeys,
+  UserData,
+}
+
+#[derive(
+  Debug, derive_more::Display, derive_more::Error, derive_more::From,
+)]
+pub enum Error {
+  UrlError(url::ParseError),
+  ReqwestError(reqwest::Error),
+  JsonError(serde_json::Error),
+}