I wonder if anyone can advise me on the best approach to achieve the changes I want to the way my data is organised on my Mac Pro? First off, here's how it's set up at the moment: 250GB boot drive for OS X Tiger 500GB data drive 1 500GB data drive 2 The two data drives are set up as a mirrored RAID in case one of them turns up its toes. This is what I want to get to: 250GB boot drive for OS X Leopard 500GB data drive 500GB Time Machine drive So, in a nutshell, I want to get rid of the RAID array without trashing my data and use Time Machine so that my boot drive is backed up as well as my data drive and I have the "time machine" features not available with a traditional mirror. If I remove data drive 2 so OS X thinks the drive is dead and then plug it into my spare bay then will I effectively be able to see both copies of my old RAID on data drives 1 and 2? I'm thinking that then I could delete the array, format data drive 2 and make it my Time Machine target. Or am I over confusing things?! Before you ask, I've got a 250GB USB drive to which I've "SuperDuper'd" my boot drive ready for my upgrade to 10.5 and an old NAS drive onto which I'm going to copy my data (just in case). As I've only got a 100-Base ethernet network I don't really want to copy the data back from the NAS to the Pro as this will take so long to do - although I will if I have to! Any ideas?