I'd like to create a 2-4 Gb central library, running itunes permantenly on a headless Mac Mini. The library will contain all music and videos and should be available to an Apple TV, PC and Iphones (remote). I am not sure about what kind of storage solution to buy. I want a second disk for backups, ideally also for storage of system backups of my PC and iphones. Should I buy and install a NAS and connect via Ethernet or are two firewire or usb 3.0 external hdds connected to the Mac Mini a better solution? I want to avoid issues with corrupt itunes libraries, missing files, connection issues with home sharing, etc. And are external hdds built to run 24//24 in terms of life span, energy consumption and heating? If an external Firewire HDD is a better solution than a NAS, how about this one: Western Digital My Book Studio WDBC3G0030HAL, 3 TB, FireWire, FireWire 800, USB. Or if I should buy a NAS, any suggestions?