Hi, Basically, I am thinking about moving from my current set up of two 500GB hard drives in my PowerMac to RAID0 for better performance. However, I have had recommendations to use a backup hard drive to mirror my PowerMac, and so a few questions: How essential is a backup/mirror when using RAID? Do I need additional hardware to make a RAID configuration? (I have seen mention to RAID cards) Are there other hard drive configurations which offer greater performance? Thanks for any advice.