diff --git a/main.py b/main.py
index acde39d..cc25c8b 100644
--- a/main.py
+++ b/main.py
@@ -844,6 +844,7 @@ class VkChatManager(QMainWindow):
             f"set SRC_DIR={source_dir}",
             f"set EXE_NAME={exe_name}",
             f"set TARGET_PID={target_pid}",
+            "set BACKUP_DIR=%TEMP%\\anabasis_backup_%RANDOM%%RANDOM%",
             ":wait_for_exit",
             "tasklist /FI \"PID eq %TARGET_PID%\" | find \"%TARGET_PID%\" >nul",
             "if %ERRORLEVEL% EQU 0 (",
@@ -851,13 +852,26 @@ class VkChatManager(QMainWindow):
             "  goto :wait_for_exit",
             ")",
             "timeout /t 1 /nobreak >nul",
+            "mkdir \"%BACKUP_DIR%\" >nul 2>&1",
+            "robocopy \"%APP_DIR%\" \"%BACKUP_DIR%\" /E /NFL /NDL /NJH /NJS /NP /R:6 /W:2 >nul",
+            "set RC=%ERRORLEVEL%",
+            "if %RC% GEQ 8 goto :backup_error",
             "robocopy \"%SRC_DIR%\" \"%APP_DIR%\" /E /NFL /NDL /NJH /NJS /NP /R:12 /W:2 >nul",
             "set RC=%ERRORLEVEL%",
-            "if %RC% GEQ 8 goto :copy_error",
+            "if %RC% GEQ 8 goto :rollback",
             "start \"\" \"%APP_DIR%\\%EXE_NAME%\"",
+            "timeout /t 2 /nobreak >nul",
+            "tasklist /FI \"IMAGENAME eq %EXE_NAME%\" | find /I \"%EXE_NAME%\" >nul",
+            "if %ERRORLEVEL% NEQ 0 goto :rollback",
+            "rmdir /S /Q \"%BACKUP_DIR%\" >nul 2>&1",
             "exit /b 0",
-            ":copy_error",
-            "echo Auto-update failed with code %RC% > \"%APP_DIR%\\update_error.log\"",
+            ":rollback",
+            "robocopy \"%BACKUP_DIR%\" \"%APP_DIR%\" /E /NFL /NDL /NJH /NJS /NP /R:6 /W:2 >nul",
+            "start \"\" \"%APP_DIR%\\%EXE_NAME%\"",
+            "echo Auto-update failed. Rollback executed. > \"%APP_DIR%\\update_error.log\"",
+            "exit /b 2",
+            ":backup_error",
+            "echo Auto-update failed during backup. Code %RC% > \"%APP_DIR%\\update_error.log\"",
             "exit /b %RC%",
         ]
         with open(script_path, "w", encoding="utf-8", newline="\r\n") as f:
diff --git a/tests/test_auth_relogin_smoke.py b/tests/test_auth_relogin_smoke.py
index f45744a..577fd2a 100644
--- a/tests/test_auth_relogin_smoke.py
+++ b/tests/test_auth_relogin_smoke.py
@@ -48,6 +48,8 @@ class AuthReloginSmokeTests(unittest.TestCase):
         self.assertIn("def _verify_update_checksum(self, zip_path, checksum_url, download_name):", self.source)
         self.assertIn("def _build_update_script(self, app_dir, source_dir, exe_name, target_pid):", self.source)
         self.assertIn("set TARGET_PID=", self.source)
+        self.assertIn("set BACKUP_DIR=", self.source)
+        self.assertIn(":rollback", self.source)
 
 
 if __name__ == "__main__":