diff --git a/src/Support/Filesystem.php b/src/Support/Filesystem.php
index 2388e95..41a8757 100644
--- a/src/Support/Filesystem.php
+++ b/src/Support/Filesystem.php
@@ -21,7 +21,14 @@ public static function copy(string $source, string $target, bool $deleteSource =
             if ($file === '.' || $file === '..') {
                 continue;
             }
-            \Nette\Utils\FileSystem::copy($source . '/' . $file, $target . '/' . $file);
+
+            $sourcePath = $source . '/' . $file;
+            $targetPath = $target . '/' . $file;
+            if (is_dir($sourcePath)) {
+                self::copy($sourcePath, $targetPath, $deleteSource);
+            } else {
+                \Nette\Utils\FileSystem::copy($sourcePath, $targetPath);
+            }
         }
         if ($deleteSource) {
             \Nette\Utils\FileSystem::delete($source);
diff --git a/src/Support/tests/Unit/FilesystemTest.php b/src/Support/tests/Unit/FilesystemTest.php
new file mode 100644
index 0000000..195b9a8
--- /dev/null
+++ b/src/Support/tests/Unit/FilesystemTest.php
@@ -0,0 +1,59 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * This file is part of MineAdmin.
+ *
+ * @link     https://www.mineadmin.com
+ * @document https://doc.mineadmin.com
+ * @contact  root@imoi.cn
+ * @license  https://github.com/mineadmin/MineAdmin/blob/master/LICENSE
+ */
+use Mine\Support\Filesystem;
+use Nette\Utils\FileSystem as BaseFileSystem;
+
+describe('copy', function () {
+    beforeEach(function () {
+        $this->sourceDir = sys_get_temp_dir() . '/source_' . uniqid();
+        $this->targetDir = sys_get_temp_dir() . '/target_' . uniqid();
+
+        BaseFileSystem::createDir($this->sourceDir);
+        BaseFileSystem::createDir($this->targetDir);
+    });
+
+    afterEach(function () {
+        BaseFileSystem::delete($this->sourceDir);
+        BaseFileSystem::delete($this->targetDir);
+    });
+
+    it('can copy nested directories while preserving existing files', function () {
+        BaseFileSystem::createDir($this->sourceDir . '/subDir');
+        file_put_contents($this->sourceDir . '/file1.txt', 'content1');
+        file_put_contents($this->sourceDir . '/subDir/file2.txt', 'content2');
+
+        BaseFileSystem::createDir($this->targetDir . '/subDir');
+        file_put_contents($this->targetDir . '/subDir/existing.txt', 'existing content');
+
+        Filesystem::copy($this->sourceDir, $this->targetDir);
+
+        expect($this->targetDir . '/subDir')->toBeDirectory()
+            ->and($this->targetDir . '/file1.txt')->toBeFile()
+            ->and($this->targetDir . '/subDir/file2.txt')->toBeFile()
+            ->and($this->targetDir . '/subDir/existing.txt')->toBeFile()
+            ->and(file_get_contents($this->targetDir . '/file1.txt'))->toBe('content1')
+            ->and(file_get_contents($this->targetDir . '/subDir/file2.txt'))->toBe('content2')
+            ->and(file_get_contents($this->targetDir . '/subDir/existing.txt'))->toBe('existing content')
+            ->and($this->sourceDir)->not->toBeDirectory();
+    });
+
+    it('can copy without deleting source directory', function () {
+        file_put_contents($this->sourceDir . '/test.txt', 'test content');
+
+        Filesystem::copy($this->sourceDir, $this->targetDir, false);
+
+        expect($this->sourceDir)->toBeDirectory()
+            ->and($this->sourceDir . '/test.txt')->toBeFile()
+            ->and($this->targetDir . '/test.txt')->toBeFile()
+            ->and(file_get_contents($this->targetDir . '/test.txt'))->toBe('test content');
+    });
+});