diff --git a/services/backup/src/blob/put_client.rs b/services/backup/src/blob/put_client.rs
--- a/services/backup/src/blob/put_client.rs
+++ b/services/backup/src/blob/put_client.rs
@@ -1,11 +1,14 @@
-use anyhow::Result;
+use anyhow::{anyhow, bail, Result};
 use tokio::{
-  sync::mpsc::{Receiver, Sender},
+  sync::mpsc::{self, Receiver, Sender},
   task::JoinHandle,
 };
-use tracing::instrument;
+use tokio_stream::wrappers::ReceiverStream;
+use tracing::{instrument, Instrument};
 
 use super::proto;
+use crate::constants::MPSC_CHANNEL_BUFFER_CAPACITY;
+
 pub use proto::put_request::Data as PutRequestData;
 pub use proto::{PutRequest, PutResponse};
 
@@ -15,23 +18,84 @@
   handle: JoinHandle<anyhow::Result<()>>,
 }
 
+/// The PutClient instance is a handle holder of a Tokio task running the
+/// actual blob client instance. The communication is done via two MPSC
+/// channels - one sending requests to the client task, and another for sending
+/// responses back to the caller. These messages should go in pairs
+/// - one request for one response.
+/// The client task can be stopped and awaited for result via the `terminate()`
+/// method.
 impl PutClient {
   /// Connects to the Blob service and keeps the client connection open
   /// in a separate Tokio task.
   #[instrument(name = "put_client")]
   pub async fn start() -> Result<Self> {
-    todo!()
+    let service_url = &crate::CONFIG.blob_service_url;
+    let mut blob_client =
+      proto::blob_service_client::BlobServiceClient::connect(
+        service_url.to_string(),
+      )
+      .await?;
+    let (blob_req_tx, blob_req_rx) =
+      mpsc::channel(MPSC_CHANNEL_BUFFER_CAPACITY);
+    let (blob_res_tx, blob_res_rx) =
+      mpsc::channel(MPSC_CHANNEL_BUFFER_CAPACITY);
+    let client_thread = async move {
+      match blob_client
+        .put(tonic::Request::new(ReceiverStream::new(blob_req_rx)))
+        .await
+      {
+        Ok(response) => {
+          let mut response_stream = response.into_inner();
+          loop {
+            match response_stream.message().await? {
+              Some(response_message) => {
+                // warning: this will produce an error if there's more unread
+                // responses than MPSC_CHANNEL_BUFFER_CAPACITY
+                // so you should always read the response MPSC channel
+                // right after sending a request to dequeue the responses
+                // and make room for more.
+                // The PutClient::put() function should take care of that
+                if let Err(err) = blob_res_tx.try_send(response_message) {
+                  bail!(err);
+                }
+              }
+              // Response stream was closed
+              None => break,
+            }
+          }
+        }
+        Err(err) => {
+          bail!(err.to_string());
+        }
+      };
+      Ok(())
+    };
+    let handle = tokio::spawn(client_thread.in_current_span());
+
+    Ok(PutClient {
+      req_tx: blob_req_tx,
+      res_rx: blob_res_rx,
+      handle,
+    })
   }
 
   /// Sends a [`PutRequest`] to the stream and waits for blob service
   /// to send a response. After all data is sent, the [`PutClient::terminate`]
   /// should be called to end the transmission and handle possible errors.
   pub async fn put(&mut self, req: PutRequest) -> Result<PutResponse> {
-    todo!()
+    self.req_tx.try_send(req)?;
+    self
+      .res_rx
+      .recv()
+      .await
+      .ok_or_else(|| anyhow!("Blob client channel closed"))
   }
 
   /// Closes the connection and awaits the blob client task to finish.
   pub async fn terminate(self) -> Result<()> {
-    todo!()
+    drop(self.req_tx);
+    let thread_result = self.handle.await?;
+    thread_result
   }
 }