WD 1TB My Passport Portable External Hard Drive, Black - WDBYVG0010BBK-WESN

I have three of these. They are GREAT! Super-simple to use. Huge capacity. Cheap. I keep a recent full backup on this external drive at a remote location so that I lose nothing if my home burns down, destroyed by earthquake, or burglarized. THE BEST feature is its security. You take 30 seconds to set up password protection the first time you use the drive, and after that it opens automatically on your computer. But if lost or stolen nobody else can open it. Or you can disable this feature so that even you have to enter your password each morning when you first boot up your computer and open this eternal harddrive. They are small enough for your back Levis pocket. And utterly reliable. AAAAA rating! Keep a backup of your office computer at home, and another vice-versa. And maybe a copy in the trunk of your car.