diff --git a/src/Dto/BackupObj.php b/src/Dto/BackupObj.php
index d08c13e..f587391 100644
--- a/src/Dto/BackupObj.php
+++ b/src/Dto/BackupObj.php
@@ -32,8 +32,8 @@ public function toArray(): array
         return [
             'real_name' => $this->name,
             'name' => $this->name,
-            'created_at' => Carbon::createFromTimestamp($this->createdAt)->format(config('env-editor.timeFormat')),
-            'modified_at' => Carbon::createFromTimestamp($this->modifiedAt)->format(config('env-editor.timeFormat')),
+            'created_at' => $this->createdAt->format(config('env-editor.timeFormat')),
+            'modified_at' => $this->modifiedAt->format(config('env-editor.timeFormat')),
             'raw_content' => $this->rawContent,
             'path' => $this->path,
             'entries' => $this->entries->toArray(),
diff --git a/tests/Unit/Dto/BackupObjTest.php b/tests/Unit/Dto/BackupObjTest.php
new file mode 100644
index 0000000..0ff6a0c
--- /dev/null
+++ b/tests/Unit/Dto/BackupObjTest.php
@@ -0,0 +1,45 @@
+<?php
+
+namespace GeoSot\EnvEditor\Tests\Unit\Dto;
+
+use GeoSot\EnvEditor\Dto\BackupObj;
+use GeoSot\EnvEditor\Dto\EntryObj;
+use GeoSot\EnvEditor\Tests\TestCase;
+use Illuminate\Support\Collection;
+use PHPUnit\Framework\Attributes\Test;
+
+class BackupObjTest extends TestCase
+{
+    #[Test]
+    public function it_returns_data_as_array(): void
+    {
+        $this->app['config']->set('env-editor.timeFormat', 'd/m H:i');
+        $this->freezeTime();
+        $now = now();
+
+        $data = [
+            'name' => 'foo-file',
+            'createdAt' => $now->clone()->subHour(),
+            'modifiedAt' => $now->clone(),
+            'rawContent' => 'dummy-content',
+            'path' => 'foo-path',
+            'entries' => new Collection([
+                new EntryObj('key',
+                    'value', 1, 1),
+            ]),
+        ];
+
+        $dto = new BackupObj(...$data);
+
+        $expected = [
+            'name' => 'foo-file',
+            'real_name' => 'foo-file',
+            'created_at' => $now->clone()->subHour()->format('d/m H:i'),
+            'modified_at' => $now->clone()->format('d/m H:i'),
+            'raw_content' => 'dummy-content',
+            'path' => 'foo-path',
+            'entries' => $data['entries']->toArray(),
+        ];
+        $this->assertEquals($expected, $dto->jsonSerialize());
+    }
+}
diff --git a/tests/Unit/Helpers/EntryObjTest.php b/tests/Unit/Dto/EntryObjTest.php
similarity index 97%
rename from tests/Unit/Helpers/EntryObjTest.php
rename to tests/Unit/Dto/EntryObjTest.php
index fb0e2f5..a95ef82 100644
--- a/tests/Unit/Helpers/EntryObjTest.php
+++ b/tests/Unit/Dto/EntryObjTest.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace GeoSot\EnvEditor\Tests\Unit\Helpers;
+namespace GeoSot\EnvEditor\Tests\Unit\Dto;
 
 use GeoSot\EnvEditor\Dto\EntryObj;
 use GeoSot\EnvEditor\Tests\TestCase;
diff --git a/tests/Unit/Helpers/FilesManagerTest.php b/tests/Unit/Helpers/FilesManagerTest.php
index b2dbf13..c6d05aa 100644
--- a/tests/Unit/Helpers/FilesManagerTest.php
+++ b/tests/Unit/Helpers/FilesManagerTest.php
@@ -2,12 +2,14 @@
 
 namespace GeoSot\EnvEditor\Tests\Unit\Helpers;
 
+use GeoSot\EnvEditor\Dto\EntryObj;
 use GeoSot\EnvEditor\EnvEditor;
 use GeoSot\EnvEditor\Exceptions\EnvException;
 use GeoSot\EnvEditor\Helpers\EnvFilesManager;
 use GeoSot\EnvEditor\Tests\TestCase;
 use Illuminate\Config\Repository;
 use Illuminate\Filesystem\Filesystem;
+use Illuminate\Support\Collection;
 use PHPUnit\Framework\Attributes\Group;
 use PHPUnit\Framework\Attributes\Test;
 
@@ -130,7 +132,10 @@ public function back_up_current_env_works_and_returns_bool(): void
         $backUps = $manager->getAllBackUps();
 
         $this->assertEquals(1, $backUps->count());
-        $this->assertEquals($backUps->first()->rawContent, $content);
+        $backup = $backUps->first();
+        $this->assertInstanceOf(Collection::class, $backup->entries);
+        $this->assertInstanceOf(EntryObj::class, $backup->entries->first());
+        $this->assertEquals($backup->rawContent, $content);
 
         unlink($file);
     }