diff --git a/src/cloudron.js b/src/cloudron.js
index dffd0d5f1..38d3ddb3f 100644
--- a/src/cloudron.js
+++ b/src/cloudron.js
@@ -969,7 +969,7 @@ function getLogs(options, callback) {
         if (u === 'box') args.push('--unit=box');
         else if (u === 'mail') args.push('CONTAINER_NAME=mail');
     });
-    if (format == 'short') args.push('--output=short', '-a'); else args.push('--output=json');
+    if (format === 'short') args.push('--output=short', '-a'); else args.push('--output=json');
     if (follow) args.push('--follow');
 
     var cp = spawn('/bin/journalctl', args);
diff --git a/src/storage/filesystem.js b/src/storage/filesystem.js
index fce4f6a98..1fc7fab92 100644
--- a/src/storage/filesystem.js
+++ b/src/storage/filesystem.js
@@ -23,7 +23,6 @@ var archiver = require('archiver'),
     mkdirp = require('mkdirp'),
     once = require('once'),
     path = require('path'),
-    safe = require('safetydance'),
     SettingsError = require('../settings.js').SettingsError,
     tar = require('tar-fs'),
     zlib = require('zlib');
diff --git a/src/storage/s3.js b/src/storage/s3.js
index 31b09fabe..a188462f2 100644
--- a/src/storage/s3.js
+++ b/src/storage/s3.js
@@ -116,7 +116,7 @@ function backup(apiConfig, backupId, sourceDirectories, callback) {
         };
 
         var s3 = new AWS.S3(credentials);
-        s3.upload(params, function (error, result) {
+        s3.upload(params, function (error) {
             if (error) {
                 console.error('[%s] backup: s3 upload error.', backupId, error);
                 return callback(new BackupsError(BackupsError.EXTERNAL_ERROR, error));
@@ -229,7 +229,7 @@ function copyBackup(apiConfig, oldBackupId, newBackupId, callback) {
         };
 
         var s3 = new AWS.S3(credentials);
-        s3.copyObject(params, function (error, result) {
+        s3.copyObject(params, function (error) {
             if (error && error.code === 'NoSuchKey') return callback(new BackupsError(BackupsError.NOT_FOUND));
             if (error) {
                 console.error('copyBackup: s3 copy error.', error);
@@ -284,7 +284,7 @@ function getDownloadStream(apiConfig, backupId, callback) {
 
         var s3 = new AWS.S3(credentials);
 
-        s3.headObject(params, function (error, result) {
+        s3.headObject(params, function (error) {
             // TODO ENOENT for the mock, fix upstream!
             if (error && (error.code === 'NotFound' || error.code === 'ENOENT')) return callback(new BackupsError(BackupsError.NOT_FOUND));
             if (error) return callback(new BackupsError(BackupsError.EXTERNAL_ERROR, error));