复制备份到usb盘

@echo off
setlocal enabledelayedexpansion

set "SRC=D:\backup"
set "DEST=E:\server_backup"

if not exist "%DEST%" mkdir "%DEST%"

echo ===== Copy backup files (skip existing) =====

REM 复制文件（存在则跳过，不覆盖）
robocopy "%SRC%" "%DEST%" backup_*.zip /XO /R:0 /W:0 >nul

echo ===== Keep only latest 10 files =====

REM 获取文件列表（按时间排序：最新在后面）
set count=0

for /f "delims=" %%F in ('dir "%DEST%\backup_*.zip" /b /o:-d') do (
set /a count+=1
if !count! GTR 10 (
del /f /q "%DEST%\%%F"
)
)

echo Done.
endlocal