I'm a graphics professional taking the plunge into a Mac Pro. After some research, this is my notional drive setup: ??GB SSD Boot Drive in the optical bay 2 x 1TB 7200rpm SATA in RAID0, partitioned for 1.Data and 2.Scratch (therefore <2TB data) I obviously need to make sure that RAID0 is safely backed up. I've got an online backup service in case my house burns down and I'll be backing up individual projects onto optical media, but I will of course want to Time Machine the Data partition of the RAID. Now, for that Time machine drive I can either create another RAID0 from the same kind of drives (with the risk that entails), or for about the same money get a 2TB 5400rpm (leaving a drive bay free for future use, possibly another backup). I'm no expert hence me asking but it seems a no-brainer to me; I can't see why I should not go for the 2TB 5400rpm drive option, as there is less chance of failure and speed is not really an issue for TM. Basically I'm looking for anyone that knows better to tell me if I'm right or wrong? Thanks.