Western Digital My Passport for Mac 500 GB USB 2.0 Portable External Hard Drive (Charcoal) for $59.99

The world's most popular portable drive is now smaller than ever. And it's smarter than ever with automatic, continuous backup software and password protection. If you prefer to use Apple® TimeMachine™, no problem – it works with that, too. Mac-ready. Formatted for Mac and compatible with Apple® Time Machine™, this drive is plug-and-play ready for Mac computer users. See your life safe in one place. WD SmartWare software - A visual control center with a single screen view of all your data.