diff --git a/src/backups.js b/src/backups.js
index e1413c69f..4bb0b0d90 100644
--- a/src/backups.js
+++ b/src/backups.js
@@ -196,12 +196,16 @@ function copyLastBackup(app, callback) {
     settings.getBackupConfig(function (error, backupConfig) {
         if (error) return callback(new BackupsError(BackupsError.INTERNAL_ERROR, error));
 
+        debug('copyLastBackup: copying archive %s to %s', app.lastBackupId, toFilenameArchive);
+
         api(backupConfig.provider).copyObject(backupConfig, app.lastBackupId, toFilenameArchive, function (error) {
             if (error) return callback(new BackupsError(BackupsError.EXTERNAL_ERROR, error));
 
             // TODO change that logic by adjusting app.lastBackupId to not contain the file type
             var configFileId = app.lastBackupId.slice(0, -'.tar.gz'.length) + '.json';
 
+            debug('copyLastBackup: copying config %s to %s', configFileId, toFilenameConfig);
+
             api(backupConfig.provider).copyObject(backupConfig, configFileId, toFilenameConfig, function (error) {
                 if (error) return callback(new BackupsError(BackupsError.EXTERNAL_ERROR, error));