diff --git a/services/backup/blob_client/src/get_client.rs b/services/backup/blob_client/src/get_client.rs
index 3ce8e0681..93f751a89 100644
--- a/services/backup/blob_client/src/get_client.rs
+++ b/services/backup/blob_client/src/get_client.rs
@@ -1,137 +1,137 @@
 mod proto {
   tonic::include_proto!("blob");
 }
 
 use proto::blob_service_client::BlobServiceClient;
 use proto::GetRequest;
 
 use crate::constants::{BLOB_ADDRESS, MPSC_CHANNEL_BUFFER_CAPACITY};
 use anyhow::bail;
 use crate::RUNTIME;
 use lazy_static::lazy_static;
 use std::collections::HashMap;
 use std::sync::Mutex;
 use tokio::sync::mpsc;
 use tokio::task::JoinHandle;
 
 struct ReadClient {
   rx: mpsc::Receiver<Vec<u8>>,
-  rx_handle: JoinHandle<anyhow::Result<(), anyhow::Error>>,
+  rx_handle: JoinHandle<anyhow::Result<()>>,
 }
 
 lazy_static! {
   // todo: we should consider limiting the clients size,
   // if every client is able to allocate up to 4MB data at a time
   static ref CLIENTS: Mutex<HashMap<String, ReadClient>> =
     Mutex::new(HashMap::new());
   static ref ERROR_MESSAGES: Mutex<Vec<String>> =
     Mutex::new(Vec::new());
 }
 
-fn is_initialized(holder: &str) -> anyhow::Result<bool, anyhow::Error> {
+fn is_initialized(holder: &str) -> anyhow::Result<bool> {
   if let Ok(clients) = CLIENTS.lock() {
     return Ok(clients.contains_key(holder));
   }
   bail!("couldn't access client");
 }
 
 pub fn get_client_initialize_cxx(
   holder: &str,
-) -> anyhow::Result<(), anyhow::Error> {
+) -> anyhow::Result<()> {
   if is_initialized(&holder)? {
     get_client_terminate_cxx(holder.clone())?;
   }
 
   // grpc
   if let Ok(mut grpc_client) =
     RUNTIME.block_on(async { BlobServiceClient::connect(BLOB_ADDRESS).await })
   {
     // spawn receiver thread
     let (response_thread_tx, response_thread_rx) =
       mpsc::channel::<Vec<u8>>(MPSC_CHANNEL_BUFFER_CAPACITY);
     let holder_string = holder.to_string();
     let rx_handle = RUNTIME.spawn(async move {
       let response = grpc_client
         .get(GetRequest {
           holder: holder_string,
         })
         .await?;
       let mut inner_response = response.into_inner();
       loop {
         let maybe_data = inner_response.message().await?;
         let mut result = false;
         if let Some(data) = maybe_data {
           let data: Vec<u8> = data.data_chunk;
           result = match response_thread_tx.send(data).await {
             Ok(_) => true,
             Err(err) => {
               bail!(err);
             }
           }
         }
         if !result {
           break;
         }
       }
       Ok(())
     });
 
     if let Ok(mut clients) = CLIENTS.lock() {
       let client = ReadClient {
         rx_handle,
         rx: response_thread_rx,
       };
       (*clients).insert(holder.to_string(), client);
       return Ok(());
     }
     bail!("could not access client");
   }
   bail!("could not successfully connect to the blob server")
 }
 
 pub fn get_client_blocking_read_cxx(
   holder: &str,
-) -> anyhow::Result<Vec<u8>, anyhow::Error> {
+) -> anyhow::Result<Vec<u8>> {
   Ok(RUNTIME.block_on(async {
     if let Ok(mut clients) = CLIENTS.lock() {
       if let Some(client) = clients.get_mut(&holder.to_string()) {
         let maybe_data = client.rx.recv().await;
         return Ok(maybe_data.unwrap_or_else(|| vec![]));
       } else {
         bail!(format!("no client present for {}", holder));
       }
     } else {
       bail!("couldn't access client");
     }
   })?)
 }
 
 pub fn get_client_terminate_cxx(
   holder: &str,
-) -> anyhow::Result<(), anyhow::Error> {
+) -> anyhow::Result<()> {
   if !is_initialized(&holder)? {
     return Ok(());
   }
   if let Ok(mut clients) = CLIENTS.lock() {
     match clients.remove(&holder.to_string()) {
       Some(client) => {
         RUNTIME.block_on(async {
           if client.rx_handle.await.is_err() {
             bail!(format!("awaiting for the client {} failed", holder));
           }
           Ok(())
         })?;
       }
       None => {
         bail!(format!("no client foudn for {}", holder));
       }
     }
   } else {
     bail!("couldn't access client");
   }
 
   if is_initialized(&holder)? {
     bail!("client transmitter handler released properly");
   }
   Ok(())
 }
diff --git a/services/backup/blob_client/src/put_client.rs b/services/backup/blob_client/src/put_client.rs
index 5a8aa5d90..592f9169e 100644
--- a/services/backup/blob_client/src/put_client.rs
+++ b/services/backup/blob_client/src/put_client.rs
@@ -1,250 +1,250 @@
 mod proto {
   tonic::include_proto!("blob");
 }
 
 use proto::blob_service_client::BlobServiceClient;
 use proto::put_request;
 use proto::put_request::Data::*;
 use proto::PutRequest;
 
 use crate::constants::{BLOB_ADDRESS, MPSC_CHANNEL_BUFFER_CAPACITY};
 use anyhow::bail;
 use crate::RUNTIME;
 use lazy_static::lazy_static;
 use libc;
 use libc::c_char;
 use std::collections::HashMap;
 use std::ffi::CStr;
 use std::sync::Mutex;
 use tokio::sync::mpsc;
 use tokio::task::JoinHandle;
 
 #[derive(Debug)]
 struct PutRequestData {
   field_index: usize,
   data: Vec<u8>,
 }
 
 struct BidiClient {
   tx: mpsc::Sender<PutRequestData>,
 
   rx: mpsc::Receiver<String>,
-  rx_handle: JoinHandle<anyhow::Result<(), anyhow::Error>>,
+  rx_handle: JoinHandle<anyhow::Result<()>>,
 }
 
 lazy_static! {
   // todo: we should consider limiting the clients size,
   // if every client is able to allocate up to 4MB data at a time
   static ref CLIENTS: Mutex<HashMap<String, BidiClient>> =
     Mutex::new(HashMap::new());
   static ref ERROR_MESSAGES: Mutex<Vec<String>> =
     Mutex::new(Vec::new());
 }
 
-fn is_initialized(holder: &str) -> anyhow::Result<bool, anyhow::Error> {
+fn is_initialized(holder: &str) -> anyhow::Result<bool> {
   match CLIENTS.lock() {
     Ok(clients) => Ok(clients.contains_key(holder)),
     _ => bail!("couldn't access client")
   }
 }
 
 pub fn put_client_initialize_cxx(
   holder: &str,
-) -> anyhow::Result<(), anyhow::Error> {
+) -> anyhow::Result<()> {
   if is_initialized(&holder)? {
     put_client_terminate_cxx(&holder.to_string())?;
   }
   if is_initialized(&holder)? {
     bail!("client cannot be initialized twice");
   }
   // grpc
   if let Ok(mut grpc_client) =
     RUNTIME.block_on(async { BlobServiceClient::connect(BLOB_ADDRESS).await })
   {
     let (request_thread_tx, mut request_thread_rx) =
       mpsc::channel::<PutRequestData>(MPSC_CHANNEL_BUFFER_CAPACITY);
 
     let outbound = async_stream::stream! {
       let mut maybe_error: Option<String> = None;
       while let Some(data) = request_thread_rx.recv().await {
         let request_data: Option<put_request::Data> = match data.field_index {
           1 => {
             match String::from_utf8(data.data) {
               Ok(utf8_data) => Some(Holder(utf8_data)),
               _ => {
                 maybe_error = Some("invalid utf-8".to_string());
                 break;
               },
             }
           }
           2 => {
             match String::from_utf8(data.data).ok() {
               Some(utf8_data) => Some(BlobHash(utf8_data)),
               None => {
                 maybe_error = Some("invalid utf-8".to_string());
                 break;
               },
             }
           }
           3 => {
             Some(DataChunk(data.data))
           }
           _ => {
             maybe_error = Some(format!("invalid field index value {}", data.field_index));
             break;
           }
         };
         if let Some (unpacked_data) = request_data {
           let request = PutRequest {
             data: Some(unpacked_data),
           };
           yield request;
         } else {
           maybe_error = Some("an error occured, aborting connection".to_string());
           break;
         }
       }
       if let Some(error) = maybe_error {
         // todo consider handling this differently
         println!("an error occured in the stream: {}", error);
       }
     };
 
     // spawn receiver thread
     let (response_thread_tx, response_thread_rx) =
       mpsc::channel::<String>(MPSC_CHANNEL_BUFFER_CAPACITY);
     let rx_handle = RUNTIME.spawn(async move {
       match grpc_client.put(tonic::Request::new(outbound)).await {
         Ok(response) => {
           let mut inner_response = response.into_inner();
           loop {
             let maybe_response_message = inner_response.message().await?;
             let mut result = false;
             if let Some(response_message) = maybe_response_message {
               // warning: this will produce an error if there's more unread
               // responses than MPSC_CHANNEL_BUFFER_CAPACITY
               // you should then use put_client_blocking_read_cxx in order
               // to dequeue the responses in c++ and make room for more
               if let Ok(_) = response_thread_tx
                 .try_send((response_message.data_exists as i32).to_string())
               {
                 result = true;
               } else {
                 bail!("response queue full");
               }
             }
             if !result {
               break;
             }
           }
         }
         Err(err) => {
           bail!(err.to_string());
         }
       };
       Ok(())
     });
 
     if is_initialized(&holder)? {
       bail!(format!(
         "client initialization overlapped for holder {}",
         holder
       ));
     }
     if let Ok(mut clients) = CLIENTS.lock() {
       let client = BidiClient {
         tx: request_thread_tx,
         rx: response_thread_rx,
         rx_handle,
       };
       (*clients).insert(holder.to_string(), client);
       return Ok(());
     }
     bail!(format!("could not access client for holder {}", holder));
   }
   bail!("could not successfully connect to the blob server");
 }
 
 pub fn put_client_blocking_read_cxx(
   holder: &str,
-) -> anyhow::Result<String, anyhow::Error> {
+) -> anyhow::Result<String> {
   Ok(RUNTIME.block_on(async {
     if let Ok(mut clients) = CLIENTS.lock() {
       let maybe_client = clients.get_mut(holder);
       if let Some(client) = maybe_client {
         if let Some(data) = client.rx.recv().await {
           return Ok(data);
         } else {
           bail!("couldn't receive data via client's receiver");
         }
       } else {
         bail!(format!(
           "no client detected for {} in blocking read",
           holder
         ));
       }
     } else {
       bail!("couldn't access clients");
     }
   })?)
 }
 
 /**
  * field index:
  * 1 - holder (utf8 string)
  * 2 - blob hash (utf8 string)
  * 3 - data chunk (bytes)
  */
 pub fn put_client_write_cxx(
   holder: &str,
   field_index: usize,
   data: *const c_char,
-) -> anyhow::Result<(), anyhow::Error> {
+) -> anyhow::Result<()> {
   let data_c_str: &CStr = unsafe { CStr::from_ptr(data) };
   let data_bytes: Vec<u8> = data_c_str.to_bytes().to_vec();
 
   RUNTIME.block_on(async {
     if let Ok(clients) = CLIENTS.lock() {
       let maybe_client = clients.get(&holder.to_string());
       if let Some(client) = maybe_client {
         client
           .tx
           .send(PutRequestData {
             field_index,
             data: data_bytes,
           })
           .await?;
         return Ok(());
       }
       bail!(format!("no client detected for {} in write", holder));
     } else {
       bail!("couldn't access clients");
     }
   })?;
   Ok(())
 }
 
 pub fn put_client_terminate_cxx(
   holder: &str,
-) -> anyhow::Result<(), anyhow::Error> {
+) -> anyhow::Result<()> {
   if !is_initialized(&holder)? {
     return Ok(());
   }
 
   if let Ok(mut clients) = CLIENTS.lock() {
     let maybe_client = clients.remove(&holder.to_string());
     if let Some(client) = maybe_client {
       drop(client.tx);
       RUNTIME.block_on(async { client.rx_handle.await? })?;
     } else {
       bail!("no client detected in terminate");
     }
   } else {
     bail!("couldn't access client");
   }
 
   if is_initialized(&holder)? {
     bail!("client transmitter handler released properly");
   }
   Ok(())
 }