Until recently, I never thought about purchasing something like the Icy Box IB-NAS4220-B External NAS Enclosure. In fact, the only enclosures needed were for sheer back up. Then one day I thought to myself, it would be nice if I could access my files from any PC connected to the network. No more need for 3 or 4 separate external drive enclosures for each room with hard drives. It gets a little pricey when you have 3 or 4 systems. The NAS4220 really centralizes the storage need more efficiently.