Add backupDone hook

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();
+}
+