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Here's an adapter that makes any SATA or IDE disk function as a backup unit, and with its included PCClone EX Lite software it can back up your hard drive with the simple push of a button.

This adapter lets you either backup from PC to a bare drive or copy from one drive to another. It also has a dual mode that lets you backup a SATA and IDE drive at the same time. Pretty neat trick for $40.

USB 2.0 To SATA/IDE Adapter With One Touch Backup [Brando]