"External backup drives are really important these days with all of the important information that we all have stores on our computers. Just think about it...what would you do if you lost all of your financial documents, photos, e-mail contacts, and more? With the Clickfree HD325 you get file backup protection and 320GBs of space to backup all of your precious files. It is both Mac and PC compatible and connects using a USB 2.0 interface for fast file transfers."