I have a 2008 Mac Pro, with 4x1TB hard disks. Currently I have one for boot and applications, 1 for projects, that is, client work, 1 for media, such as animations, After Effects/Premier files, photos etc., and one for Time Machine. I've got Time Machine set to back up the various important library/prefs on the Boot disk, and the Projects folder. I take a backup of the rest of the important stuff about once a month, using two 500mb HD's which I rotate, storing one offsite, and backup the finished projects to DVD. I suspect that this may not be the smartest setup, and that some sort of RAID config may be better. My knowledge of the various flavours of RAID is very limited (read: none!) The reason is I just had the Projects HD fail, and while restoring everything wasn't terribly difficult, it made me think about other options. Would it be possible to keep the Boot disk as is, use 2 or three of the internal HD's for RAID, and use a 2TB external for TM? What's the size limit for the internals - I seem to recall it being 1TB but I could be wrong. Any advice/recommendations/personal experience would be greatly appreciated. Just for info - I do a lot of 3D work, illustrations, page layout, web design, animations and short CGI movies, the machine runs 24/7, and is usually rendering something. No hardware issues to date - the darn thing is built like a dreadnaught!