Creating a backup batch file

I’m trying to create a date stamped batch file for someone. Basically we had a batch file running to save the payroll info every night, what happened the last time was the file was corrupted after the last weeks wages were imput and the backup copied the last corrupted file. Anyway we can create a batch file to copy every night and keep each copy instead of overwriting the last one, maybe even for five or ten times and then overwrite? hope this makes sense…