fix: break out of accept() loop if there is an error transferring backup

src/imex/transfer.rs

@@ -243,6 +243,7 @@ impl BackupProvider {
                             Err(format_err!("Backup provider dropped"))
                         }).await {
                             warn!(context, "Error while handling backup connection: {err:#}.");
+                            break;
                         } else {
                             info!(context, "Backup transfer finished successfully.");
                             break;