Windows has its own zip command. You can put the code below in the backup.bat file and run.
@echo off
:: variables
set drive=E:\backup
set backupcmd=xcopy /s /c /d /e /h /i /r /y
echo
%backupcmd% "e:\Repositories" "%drive%\SVNrepository\Repositories"
e:
cd "%drive%\SVNrepository"
zip -r -S -T -$ -m Repositories.zip Repositories
set filename="..\Repository_bak_%date:~0,4%%date:~5,2%%date:~8,2%_%time:~0,2%%time:~3,2%.zip"
move .\*.zip %filename%
cd E:\backup\
echo Backup Complete!
rem @pause
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