diff --git a/src/backend/README.md b/src/backend/README.md
index cc340a6..0a34790 100644
--- a/src/backend/README.md
+++ b/src/backend/README.md
@@ -1,7 +1,7 @@
 # AI-powered-switches Backend
 
 这是 AI-powered-switches 的后端服务，基于 `Flask` 构建，提供 `REST API` 接口，用于解析自然语言生成网络交换机配置并下发到设备
-
+注意下载Nmap才可扫描交换机网址：https://nmap.org/download.html
 ### 项目结构
 
 ```bash
diff --git a/src/backend/app/api/endpoints.py b/src/backend/app/api/endpoints.py
index c5d3678..917bb2a 100644
--- a/src/backend/app/api/endpoints.py
+++ b/src/backend/app/api/endpoints.py
@@ -1,4 +1,4 @@
-from fastapi import APIRouter, Depends, HTTPException
+from fastapi import (APIRouter, HTTPException)
 from typing import List
 from pydantic import BaseModel
 
@@ -86,4 +86,5 @@ async def apply_config(request: ConfigRequest):
         raise HTTPException(
             status_code=500,
             detail=f"Failed to apply config: {str(e)}"
-        )
\ No newline at end of file
+        )
+
diff --git a/src/backend/app/api/network_config.py b/src/backend/app/api/network_config.py
index 3f791c2..ebc1b82 100644
--- a/src/backend/app/api/network_config.py
+++ b/src/backend/app/api/network_config.py
@@ -1,8 +1,11 @@
 import paramiko
 import asyncio
+import aiofiles
+from datetime import datetime
 from typing import Dict, List, Optional, Union
 from tenacity import retry, stop_after_attempt, wait_exponential, retry_if_exception_type
 from pydantic import BaseModel
+from paramiko.channel import ChannelFile
 import logging
 
 
@@ -41,6 +44,7 @@ class SwitchConfigurator:
             is_emulated: bool = False,
             emulated_delay: float = 2.0
     ):
+
         """
         初始化配置器
 
diff --git a/src/backend/app/utils/exceptions.py b/src/backend/app/utils/exceptions.py
index 4108d08..ccbd2de 100644
--- a/src/backend/app/utils/exceptions.py
+++ b/src/backend/app/utils/exceptions.py
@@ -1,4 +1,5 @@
 from fastapi import HTTPException, status
+from typing import Optional
 
 class AICommandParseException(HTTPException):
     def __init__(self, detail: str):
@@ -8,15 +9,28 @@ class AICommandParseException(HTTPException):
         )
 
 class SwitchConfigException(HTTPException):
-    def __init__(self, detail: str):
+    def __init__(
+        self,
+        detail: str,
+        status_code: int = status.HTTP_500_INTERNAL_SERVER_ERROR
+    ):
         super().__init__(
-            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
-            detail=f"Switch configuration error: {detail}"
+            status_code=status_code,
+            detail=f"Switch error: {detail}"
         )
 
-class SiliconFlowAPIException(HTTPException):
-    def __init__(self, detail: str):
+class ConfigBackupException(SwitchConfigException):
+    """配置备份失败异常"""
+    def __init__(self, ip: str):
         super().__init__(
-            status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
-            detail=f"SiliconFlow API error: {detail}"
-        )
\ No newline at end of file
+            detail=f"无法备份设备 {ip} 的配置",
+            recovery_guide="检查设备存储空间或权限"
+        )
+
+class ConfigRollbackException(SwitchConfigException):
+    """回滚失败异常"""
+    def __init__(self, ip: str, original_error: str):
+        super().__init__(
+            detail=f"设备 {ip} 回滚失败（原始错误：{original_error}）",
+            status_code=status.HTTP_422_UNPROCESSABLE_ENTITY
+        )
diff --git a/src/backend/requirements.txt b/src/backend/requirements.txt
index 4ca45f3..916c9ce 100644
--- a/src/backend/requirements.txt
+++ b/src/backend/requirements.txt
@@ -7,4 +7,5 @@ pydantic>=1.10.7
 loguru>=0.7.0
 python-nmap>=0.7.1
 tenacity>=9.1.2
-typing-extensions>=4.0.0
\ No newline at end of file
+typing-extensions>=4.0.0
+aiofiles>=24.1.0
\ No newline at end of file
diff --git a/switch_devices.json b/switch_devices.json
new file mode 100644
index 0000000..0637a08
--- /dev/null
+++ b/switch_devices.json
@@ -0,0 +1 @@
+[]
\ No newline at end of file