echo off
cls
rem --------------- Variables --------------- 
set packName=DbName
set connection=-S Server -U User -P Password
set path=PathForSaveBackup
rem --------------- Variables --------------- 

echo create backup
sqlcmd %connection% -Q "BACKUP DATABASE %packName% TO DISK = '%path%\%packName%.bak'"

echo compress backup file
..\tools\7za.exe a %path%\%packName%.7z %path%\%packName%.bak

echo delete backup file
del %path%\%packName%.bak