怎么实现服务器中的文件差异备份

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使用小巧强大的7z(不到1M),实现差异文件备份.

::This script backup the data from srvdatacn01::It's an ancremental backups tools, One base file and diff files for each day.::The files be deleted at srvdatacn01 are still keep saved at archived diff files, until them be deleted.::Make sure you DateTime format is "yyyy-mm-dd", which could be use as one filenme(exclude / \ * :)::Add C:\Program Files\7-Zip\ to environment variables path:: Delete the diff archive files which over 7 days:: Command forfiles doesn't support UNC path, so need map the path to driver firstif not exist \\srvdatacn02\d (      NET USE Y: \\srvdatacn02\d)forfiles /P Y: /M backup_srvdatacn01*diff*.zip /C "cmd /c del /q/f @path" /D -7NET USE Y: /Dcall :backup "folder1","folder2","folder3","folder4","folder5":backupfor %%i in (%*) do (  if not exist "d:\backup_srvdatacn01_%%~i_base.7z" (     7z a "d:\backup_srvdatacn01_%%~i_base.7z" "\\srvdatacn01\%%~i\*" -xr!Thumbs.db -mx9  ) else (     7z u "d:\backup_srvdatacn01_%%~i_base.7z" "\\srvdatacn01\%%~i\*" -u- -up0q1r2x2y2z0w0!"d:\backup_srvdatacn01_%%~i_diff_%date:/=_%_%time::=_%.7z" -xr!Thumbs.db -mx9     7z u "d:\backup_srvdatacn01_%%~i_base.7z" "\\srvdatacn01\%%~i\*" -up0q0r2x2y2z1w1 -xr!Thumbs.db -mx9  ))goto:eof

** forfiles 需要使用盘符映射**

删除N天以前的文件

forfiles /P Y: /M backup_srvdatacn01*diff*.zip /C "cmd /c del /q/f @path" /D -7

将差异文件写入diff包

     7z u "d:\backup_srvdatacn01_%%~i_base.7z" "\\srvdatacn01\%%~i\*" -u- -up0q1r2x2y2z0w0!"d:\backup_srvdatacn01_%%~i_diff_%date:/=_%_%time::=_%.7z" -xr!Thumbs.db -mx9

更新基础包

7z u "d:\backup_srvdatacn01_%%~i_base.7z" "\\srvdatacn01\%%~i\*" -up0q0r2x2y2z1w1 -xr!Thumbs.db -mx9

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