My sister needs a backup drive (Time Machine) for her 13" MacBook Pro 8.1 and I'm suggesting a bus-powered type since that means just one cable and thereby less hassle. Her internal drive is 750GB so I assume she'd need something like 1TB. The computer's got both Firewire 800, Thunderbolt and USB ports. I assume the former two would be best. I've personally got a G-drive Mini connected to my Powerbook G4's Firewire port, but it's a little pricey and I don't think they go past 750GB. Which other drives can she consider which won't need messy cables and power adapters?