Backup Procedure

Hi all, Can someone please help me with a backup procedure that I am trying to figure out. I have a SuSE8.1 machine being a PDC in a small Windows network. I would like every day, at 12:00 midnight, the PDC to initialize a backup procedure where all the files of specific directories be backed-up. The problem is not to make a small script. That I have accomplished so far. I want to be able to have a 5 day backup with days on numbers i.e. Backup_Mon, Backup_Tue etc... I have no idea how to do this. Can someone please help me? Thank you!!! Chris