Amazon has the Limited Edition Western Digital My Passport Essential 500GB USB Robot Hard Drive for just $49.99 shipped, originally priced at $119.99. This model is “smarter than ever with automatic, continuous backup software and password protection.” Product page.
Relax, your data is secure. Automatic, continuous backup will instantly make a second copy whenever you add or change a file. Retrieve your valuable data to its original location whether you’ve lost all your data or just overwritten an important file.