I've been tasked, at work, to replace a Windows system with an Apple one. The computer is used to hold photographic and video evidence. At the moment we have about 350 gig on 3 separate external drives. The idea would be to put all that onto the new computer's internal drive. What is the best way to back this up, and possibly have a backup of the backup? I had thought of using TM to a mirrored RAID setup, but posters in other topics on this site seem to indicate that this is not ideal. So, TM to an external drive, but can TM make backups to a second drive as well?