diff --git a/services/commtest/tests/backup_performance_test.rs b/services/commtest/tests/backup_performance_test.rs
--- a/services/commtest/tests/backup_performance_test.rs
+++ b/services/commtest/tests/backup_performance_test.rs
@@ -4,6 +4,8 @@
 mod backup_utils;
 #[path = "./backup/create_new_backup.rs"]
 mod create_new_backup;
+#[path = "./backup/send_log.rs"]
+mod send_log;
 #[path = "./lib/tools.rs"]
 mod tools;
 
@@ -128,6 +130,54 @@
     });
 
     // SEND LOG
+    rt.block_on(async {
+      println!("performing SEND LOG operations");
+      let mut handlers = vec![];
+      let (sender, receiver) = channel::<(usize, usize, String)>();
+      for (backup_index, backup_item) in backup_data.iter().enumerate() {
+        let backup_item_cloned = backup_item.clone();
+        for log_index in 0..backup_item_cloned.log_items.len() {
+          let backup_item_recloned = backup_item_cloned.clone();
+          let mut client_cloned = client.clone();
+          let sender_cloned = sender.clone();
+          handlers.push(tokio::spawn(async move {
+            println!("sending log {}/{}", backup_index, log_index);
+            let id = send_log::run(
+              &mut client_cloned,
+              &backup_item_recloned,
+              log_index,
+            )
+            .await
+            .unwrap();
+            assert!(!id.is_empty(), "log id should not be empty after sending");
+            sender_cloned.send((backup_index, log_index, id)).unwrap();
+          }));
+        }
+      }
+      drop(sender);
+
+      for handler in handlers {
+        handler.await.unwrap();
+      }
+      for data in receiver {
+        println!("received: {:?}", data);
+        let (backup_index, log_index, id) = data;
+        backup_data[backup_index].log_items[log_index].id = id;
+      }
+    });
+
+    // check if log IDs are properly set
+    for (backup_index, backup_item) in backup_data.iter().enumerate() {
+      for (log_index, log_item) in backup_item.log_items.iter().enumerate() {
+        assert!(
+          !log_item.id.is_empty(),
+          "missing log id for backup index {} and log index {}",
+          backup_index,
+          log_index
+        );
+      }
+    }
+
     // ADD ATTACHMENTS
     // PULL BACKUP
   })