My perfect scenario is to set up one of the disks to be an iTunes server and general file storage for photos (managing with iPhoto) and documents, then to set the second disk as a backup (versus RAID1) to the first disk. Is this possible. If I can only set it as RAID1 and not a back-up, can it be backed-up to Time Capsule using Time Machine? The answers to these specifics haven't been clear to me through a Google search.