Veritas Backup Exec 8.x5 schedule backup

Do you know anything about Backup Exec 8.8 NT.I am “trying” to set up a bakup schedule that will backup my *.mdb files (90MB)every weekday night @ 5:30PM.I want the files not to overwrite each other until the following weekday ie:Monday 01/01 remains on tape until the following Monday 07/01.This enables me to have an offsite copy of the previous 5 days data.I have set the schedule up but on the second night it started to load and then hung.If I choose run now from menu it is fine.I originally tried to do this to bakup every 3 hours but when it ran it locked all users out of database.Great.Any help appreciated + thanx for your time.