Toshiba 250GB TOSHIBA USB 2.0 PORTABLE EXTERNAL 25 250 GB Hard... Recommendations

The included NTI Shadow backup software eliminates the need to push a button or click an icon to activate a backup. The software runs in the background capturing updates to files and automatically saving them to the external drive. The Toshiba USB 2.0 Portable External Hard Drive is automatically powered through the included USB 2.0 cable, eliminating the need for a power adapter.