For the past month, I've been putting off getting some backup drives for my Powermac. My PM has a 160 gig hard drive right now. What I would really like is to have a second 160 gig drive inside the PM, in a RAID type setup, where everything on the main drive is backed up instantly. Then, for backing up all my client's photos, I'll have an external 250 gig FW drive. How do you achieve the RAID setup? I know next to nothing about all of this, but I need to get something done fairly quickly.