@echo off
cls
echo Backing up DNS  configuration
echo.
echo -saving registry
if not exist reg md  reg
regedit.exe /e reg\dns.reg  "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\DNS Server\Zones"
echo  done
echo -saving  files
if not exist files md files
if exist files\*.dns del /f /q files\*.dns
copy  /v %windir%\system32\dns\*.dns files
echo  done
echo.
echo  Ready...

Dns restore:

@echo off
cls
echo Restoring up DNS  configuration
echo.
echo -loading registry
if not exist reg\dns.reg echo Fatal: Registry files doesn't  exist.  & goto :EOF
regedit.exe /s reg\dns.reg
echo   done
echo -saving files
if not exist files echo Fatal: The file  directory doesn't exist. & goto :EOF
if not exist files\*.dns echo Fatal: No .dns  files exist in files directory. & goto :EOF
copy /y /v files\*.dns %windir%\system32\dns
echo   done
echo -restarting dns service
net  stop "DNS Server"
net start "DNS Server"
echo.
echo Ready...