@echo off
@setlocal

set countfile="D:\vz\backups\backup_count.txt"

@REM file check
if not exist %countfile% echo count=0 > %countfile%

FOR /F "tokens=1,2 usebackq delims==" %%a IN (`type "%countfile%"`) DO (
	if %%a == count set count=%%b
  	@rem if %%a == pass set pass=%%b
)

@REM count check
if %count%==6 (
	set /a count=0
	echo count=%count%
) else (
	echo count=%count%
)

set /a count=%count%+1
echo count=%count% > %countfile%