Yes, but your chances of failure of two drives at the same time are much greater, let alone the chances of losing the same data on both disks at the same time. The probability is squared by adding a second disk so you are borrowing much more time. Other elements (largely of the PEBKAC type) suddenly become the greater thing to worry aboutWell the mediums of back up are subject to the same rule so theoretically everything is on borrowed time. :thumbup: