I'm using a Mac Mini running OSX Server as a home server running the Time Machine service to handle backups from several Macs. I'm looking to expand the storage and I'm considering something like the Thunder Bay 4. Should I use RAID to best make use of this or can I just set up each drive as a Backup Destination in Time Machine and it'll handle making use of the right disk to store the backups? I've gone through the Server help documentation but it doesn't seem to be too descriptive of what the options might be.