Added backup/restore function

app/Http/Controllers/BackupController.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Helpers\BackupHelper;
+use DateTime;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Storage;
+use Illuminate\Support\Facades\Validator;
+
+class BackupController extends Controller
+{
+    public function backup()
+    {
+        $data = BackupHelper::backup();
+        $timestamp = new DateTime();
+        $timestamp = $timestamp->format('Y-m-d_H:i:s');
+        $name = 'speedtest_backup_' . $timestamp . '.json';
+        Storage::disk('local')->put($name, $data);
+
+        return Storage::disk('local')->download($name);
+    }
+
+    public function restore(Request $request)
+    {
+        $rule = [
+            'data' => [ 'required', 'array' ],
+        ];
+
+        $validator = Validator::make($request->all(), $rule);
+
+        if($validator->fails()) {
+            return response()->json([
+                'error' => $validator->errors()
+            ], 422);
+        }
+
+        BackupHelper::restore($request->data);
+
+        return response()->json([
+            'method' => 'restore data from backup',
+        ], 200);
+    }
+}