diff --git a/src/storage/gcs.js b/src/storage/gcs.js
index ecd934024..5bca431c2 100644
--- a/src/storage/gcs.js
+++ b/src/storage/gcs.js
@@ -1,21 +1,21 @@
 'use strict';
 
 exports = module.exports = {
-    getBackupPath: getBackupPath,
-    checkPreconditions: checkPreconditions,
+    getBackupPath,
+    checkPreconditions,
 
-    upload: upload,
-    download: download,
-    copy: copy,
+    upload,
+    download,
+    copy,
 
-    listDir: listDir,
+    listDir,
 
-    remove: remove,
-    removeDir: removeDir,
+    remove,
+    removeDir,
 
-    testConfig: testConfig,
-    removePrivateFields: removePrivateFields,
-    injectPrivateFields: injectPrivateFields,
+    testConfig,
+    removePrivateFields,
+    injectPrivateFields,
 
     // Used to mock GCS
     _mockInject: mockInject,
@@ -212,7 +212,7 @@ function removeDir(apiConfig, pathPrefix) {
 
     var events = new EventEmitter();
 
-    const batchSize = 1000, concurrency = 10; // https://googleapis.dev/nodejs/storage/latest/Bucket.html#deleteFiles
+    const batchSize = 1000, concurrency = apiConfig.deleteConcurrency || 10; // https://googleapis.dev/nodejs/storage/latest/Bucket.html#deleteFiles
     var total = 0;
 
     listDir(apiConfig, pathPrefix, batchSize, function (entries, done) {
diff --git a/src/storage/s3.js b/src/storage/s3.js
index e2bd777aa..c143e2d18 100644
--- a/src/storage/s3.js
+++ b/src/storage/s3.js
@@ -1,21 +1,21 @@
 'use strict';
 
 exports = module.exports = {
-    getBackupPath: getBackupPath,
-    checkPreconditions: checkPreconditions,
+    getBackupPath,
+    checkPreconditions,
 
-    upload: upload,
-    download: download,
-    copy: copy,
+    upload,
+    download,
+    copy,
 
-    listDir: listDir,
+    listDir,
 
-    remove: remove,
-    removeDir: removeDir,
+    remove,
+    removeDir,
 
-    testConfig: testConfig,
-    removePrivateFields: removePrivateFields,
-    injectPrivateFields: injectPrivateFields,
+    testConfig,
+    removePrivateFields,
+    injectPrivateFields,
 
     // Used to mock AWS
     _mockInject: mockInject,