If you want to do unattended, scheduled backups with Spb Backup, then my answer would be don't use it. Scheduled backups don't work on the x51v. Checkout this thread:
http://www.spbclub.com/forum/viewtopic.php?t=2284. There are some that will say set an appt. to go off when you want Spb to initiate the backup. That may work for some but didn't work for me and others. Spb seems to be aware of the problem but is slow to resolve it. I've stopped using the scheduling part on my x51v.