Use Babel 5.

packages/xo-server-backup-reports/.babelrc

@@ -1,11 +1,11 @@
 {
   "comments": false,
   "compact": true,
-  "plugins": [
-    "transform-runtime"
-  ],
-  "presets": [
-    "stage-0",
-    "es2015"
+  "optional": [
+    "es7.asyncFunctions",
+    "es7.decorators",
+    "es7.exportExtensions",
+    "es7.functionBind",
+    "runtime"
   ]
 }

packages/xo-server-backup-reports/package.json

@@ -22,16 +22,12 @@
     "dist/"
   ],
   "dependencies": {
-    "babel-runtime": "^6.2.0",
+    "babel-runtime": "^5.8.34",
     "lodash.foreach": "^3.0.3"
   },
   "devDependencies": {
-    "babel-cli": "^6.2.0",
-    "babel-core": "^6.2.0",
+    "babel": "^5.8.34",
     "babel-eslint": "^4.1.5",
-    "babel-plugin-transform-runtime": "^6.1.18",
-    "babel-preset-es2015": "^6.1.18",
-    "babel-preset-stage-0": "^6.1.18",
     "clarify": "^1.0.5",
     "dependency-check": "^2.5.1",
     "mocha": "^2.3.4",