I used to have three external HDDs hanging off my mini to provide media storage. But now I've bought a NAS so I don't need all of them. I might want to keep one for backing up the mini but I'm not sure which to keep. one is a Western digital studio edition II with 2x1TB drives, set up as RAID1. I think this is a good one to sell as its useful, provides backup and is fairly new. one is an iomega minimax which I like because its stackable with my 2007 mini, but I have one eye on the (hopefully soon) update, and then it won't stack anymore. then I have a bog standard 750GB maxtor one-touch. Ugly, but its hidden in a cupboard. I have half a mind to sell all of them and just use a little portable HDD which doesn't take up a power slot, but what do you think?