In my mac pro I have a 250GB drive and 2x500GB drives. The 250 is used for everything except for my iTunes library which is stored on a mirrored RAID of the 500GB drives. I have an external 250GB drive which I backup my main 250GB drive to every so often. Now that Leopard is here does it make sense to continue this? I'm going to do an erase and install. With Time Machine won't the essentially take care of Mirrored RAID except even better? If I use one of the 500GB drives for my main hard drive and the other for Time Machine even if one drive goes bad I should be able to come back to where I was right? I guess the main difference being it's a once a day backup whereas RAID is all the time but that's fine by me. Is there something I'm missing here? For that matter I think I could even keep most of my files on the 250 including the system disk, put my iTunes stuff on one of the 500's and use the other 500 for the Time Machine drive. Yes? No? Try it and let you guys know?