server-ts: Convert etapi/backup

src/etapi/backup.ts

@@ -0,0 +1,16 @@
+import { Router } from "express";
+
+import eu = require('./etapi_utils');
+import backupService = require('../services/backup');
+
+function register(router: Router) {
+    eu.route(router, 'put', '/etapi/backup/:backupName', async (req, res, next) => {
+        await backupService.backupNow(req.params.backupName);
+
+        res.sendStatus(204);
+    });
+}
+
+export = {
+    register
+};