I'm looking into purchasing a mac mini as a media server for our TV, which would work well from what I understand. However, I wan't to use it as a base for wireless file backups for my laptop. I would really like to backup to a 2 drive mirrored setup in case one drive fails, so my question is, can I set up three external drives to this computer, one for media, and two to mirror a backup? If so, is it possible to backup to the drive and have it automatically mirror the data for me? Or do I have to get a dedicated RAID box?