I don't know much about RAID boxes or NAS options. I'm interested in adding a 4 bay thunderbolt raid to my setup. I would like to configure this in a specific way: 2 drives (say a pair of 2TB) mirrored..raid 1 with each other for media and files. 2 drives (pair of 4TB) mirrored..raid 1 with each other being used for Time Machine backups. ^ is this possible? It's similar to how I understand RAID10 except I want the drives to show up as 2 separate pairs. ..hold on, I'm not done yet. I'd like it to be a hardware RAID capable of rebuilding itself and I would like to be able to have extra duplicates of my Time Machine drive. For example pull one of the mirrored drives from my time machine set, store it off site and slide in a new drive and have it (the raid box) build the mirrored drive. So in the ideal scenario I have my media drive(s) and a few laptops being backed up to the time machine drive(s). With a (or multiple) duplicate time machine drives stored off site. As an extension to this, when I want to update the offsite duplicate to the current state is there a plausible way to simply append the new/modified files to the old backup or would the backup be doomed to be fully rewritten each time? I'd be willing to go so far as building a headless PC strictly for this use, though maybe that would scratch the possibility of thunderbolt connectivity?! Appreciate any info or suggestions.