diff --git a/src/backups.js b/src/backups.js
index 870a1625b..39b25a602 100644
--- a/src/backups.js
+++ b/src/backups.js
@@ -67,12 +67,6 @@ const COLLECTD_CONFIG_EJS = fs.readFileSync(__dirname + '/collectd/cloudron-back
 
 const BACKUPS_FIELDS = [ 'id', 'remotePath', 'label', 'identifier', 'creationTime', 'packageVersion', 'type', 'dependsOnJson', 'state', 'manifestJson', 'format', 'preserveSecs', 'encryptionVersion' ];
 
-// helper until all storage providers have been ported
-function maybePromisify(func) {
-    if (util.types.isAsyncFunction(func)) return func;
-    return util.promisify(func);
-}
-
 function postProcess(result) {
     assert.strictEqual(typeof result, 'object');
 
@@ -385,5 +379,5 @@ async function remount(auditSource) {
     const func = storage.api(backupConfig.provider);
     if (!func) throw new BoxError(BoxError.BAD_FIELD, 'unknown storage provider');
 
-    await maybePromisify(storage.api(backupConfig.provider).remount)(backupConfig);
+    await storage.api(backupConfig.provider).remount(backupConfig);
 }
diff --git a/src/storage/filesystem.js b/src/storage/filesystem.js
index 3d25de419..e41faee16 100644
--- a/src/storage/filesystem.js
+++ b/src/storage/filesystem.js
@@ -281,7 +281,7 @@ function validateBackupTarget(folder) {
 async function remount(apiConfig) {
     assert.strictEqual(typeof apiConfig, 'object');
 
-    if (apiConfig.provider === PROVIDER_FILESYSTEM || apiConfig.provider === PROVIDER_MOUNTPOINT) throw new BoxError(BoxError.NOT_SUPPORTED);
+    if (apiConfig.provider === PROVIDER_FILESYSTEM || apiConfig.provider === PROVIDER_MOUNTPOINT) return;
 
     await mounts.remount(mounts.mountObjectFromBackupConfig(apiConfig));
 }
diff --git a/src/storage/gcs.js b/src/storage/gcs.js
index d66cc1773..9715f84dc 100644
--- a/src/storage/gcs.js
+++ b/src/storage/gcs.js
@@ -262,11 +262,8 @@ function removeDir(apiConfig, pathPrefix) {
     return events;
 }
 
-function remount(apiConfig, callback) {
+async function remount(apiConfig) {
     assert.strictEqual(typeof apiConfig, 'object');
-    assert.strictEqual(typeof callback, 'function');
-
-    return callback(new BoxError(BoxError.NOT_SUPPORTED));
 }
 
 function testConfig(apiConfig, callback) {
diff --git a/src/storage/interface.js b/src/storage/interface.js
index 8bb9949d0..4b5d5df36 100644
--- a/src/storage/interface.js
+++ b/src/storage/interface.js
@@ -140,13 +140,12 @@ function removeDir(apiConfig, pathPrefix) {
     return events;
 }
 
-function remount(apiConfig, callback) {
+async function remount(apiConfig) {
     assert.strictEqual(typeof apiConfig, 'object');
-    assert.strictEqual(typeof callback, 'function');
 
     // Result: none
 
-    callback(new BoxError(BoxError.NOT_IMPLEMENTED, 'remount is not implemented'));
+    throw new BoxError(BoxError.NOT_IMPLEMENTED, 'remount is not implemented');
 }
 
 function testConfig(apiConfig, callback) {
diff --git a/src/storage/noop.js b/src/storage/noop.js
index 772d2b1d5..3bd988a3f 100644
--- a/src/storage/noop.js
+++ b/src/storage/noop.js
@@ -126,11 +126,8 @@ function removeDir(apiConfig, pathPrefix) {
     return events;
 }
 
-function remount(apiConfig, callback) {
+async function remount(apiConfig) {
     assert.strictEqual(typeof apiConfig, 'object');
-    assert.strictEqual(typeof callback, 'function');
-
-    callback(null);
 }
 
 function testConfig(apiConfig, callback) {
diff --git a/src/storage/s3.js b/src/storage/s3.js
index 7f953c0be..79f5df958 100644
--- a/src/storage/s3.js
+++ b/src/storage/s3.js
@@ -457,11 +457,8 @@ function removeDir(apiConfig, pathPrefix) {
     return events;
 }
 
-function remount(apiConfig, callback) {
+async function remount(apiConfig) {
     assert.strictEqual(typeof apiConfig, 'object');
-    assert.strictEqual(typeof callback, 'function');
-
-    return callback(new BoxError(BoxError.NOT_SUPPORTED));
 }
 
 function testConfig(apiConfig, callback) {