diff --git a/src/storage/caas.js b/src/storage/caas.js
index d1cd8ff0b..0d087cf78 100644
--- a/src/storage/caas.js
+++ b/src/storage/caas.js
@@ -11,6 +11,8 @@ exports = module.exports = {
     copyObject: copyObject,
     removeBackup: removeBackup,
 
+    backupDone: backupDone,
+
     testConfig: testConfig
 };
 
@@ -183,3 +185,13 @@ function testConfig(apiConfig, callback) {
 
     callback();
 }
+
+function backupDone(filename, app, appBackupIds, callback) {
+    assert.strictEqual(typeof filename, 'string');
+    assert(!app || typeof app === 'object');
+    assert(!appBackupIds || Array.isArray(appBackupIds));
+    assert.strictEqual(typeof callback, 'function');
+
+    callback();
+}
+
diff --git a/src/storage/filesystem.js b/src/storage/filesystem.js
index 17a9ac6c8..87128bd36 100644
--- a/src/storage/filesystem.js
+++ b/src/storage/filesystem.js
@@ -11,6 +11,8 @@ exports = module.exports = {
     copyObject: copyObject,
     removeBackup: removeBackup,
 
+    backupDone: backupDone,
+
     testConfig: testConfig
 };
 
@@ -151,3 +153,13 @@ function testConfig(apiConfig, callback) {
 
     callback();
 }
+
+function backupDone(filename, app, appBackupIds, callback) {
+    assert.strictEqual(typeof filename, 'string');
+    assert(!app || typeof app === 'object');
+    assert(!appBackupIds || Array.isArray(appBackupIds));
+    assert.strictEqual(typeof callback, 'function');
+
+    callback();
+}
+
diff --git a/src/storage/interface.js b/src/storage/interface.js
index 26aa692f6..00dc76fba 100644
--- a/src/storage/interface.js
+++ b/src/storage/interface.js
@@ -17,6 +17,8 @@ exports = module.exports = {
     copyObject: copyObject,
     removeBackup: removeBackup,
 
+    backupDone: backupDone,
+
     testConfig: testConfig
 };
 
@@ -111,3 +113,12 @@ function testConfig(apiConfig, callback) {
 
     callback(new Error('not implemented'));
 }
+
+function backupDone(filename, app, appBackupIds, callback) {
+    assert.strictEqual(typeof filename, 'string');
+    assert(!app || typeof app === 'object');
+    assert(!appBackupIds || Array.isArray(appBackupIds));
+    assert.strictEqual(typeof callback, 'function');
+
+    callback(new Error('not implemented'));
+}
diff --git a/src/storage/s3.js b/src/storage/s3.js
index ada7d9b90..ae473d62b 100644
--- a/src/storage/s3.js
+++ b/src/storage/s3.js
@@ -11,6 +11,8 @@ exports = module.exports = {
     copyObject: copyObject,
     removeBackup: removeBackup,
 
+    backupDone: backupDone,
+
     testConfig: testConfig
 };
 
@@ -204,3 +206,13 @@ function testConfig(apiConfig, callback) {
         });
     });
 }
+
+function backupDone(filename, app, appBackupIds, callback) {
+    assert.strictEqual(typeof filename, 'string');
+    assert(!app || typeof app === 'object');
+    assert(!appBackupIds || Array.isArray(appBackupIds));
+    assert.strictEqual(typeof callback, 'function');
+
+    callback();
+}
+