I tried to perform my regular backup to my Apple iDisk account. Unfortunately, Backup 3 informed me that I didn't have sufficient space. I tried to delete some files but I found no love. It turns out that you can't just delete the backup files on the iDisk by dragging them to the trash. This actually a pretty nice feature to make sure you don't screw yourself accidently. So it turns out that if you just check the menu under "Backup" you'll find another item called "Remove iDisk Backups." You are then presented with two options. YOu can remove all archives or just the ones created with older versions of Backup. Now my user data is safe and secure once again.