Update backup.php

fix directory path to the real cache directory

config/backup.php

@@ -28,7 +28,7 @@ return [
                  */
                 'exclude' => [
                     base_path('.git'),
-                    base_path('cache'),
+                    base_path('storage/app/public/cache'),
                     base_path('vendor'),
                     base_path('node_modules'),
                 ],