I had an extra hard drive installed on my tower just to put all my files on it. So if the "C" drive crashes, my files are hopefully still there and they can just move the hard drive to another tower. Then I have 2 external hard drives to make a backup of those files. Thought my 1st external hard drive had bit the dust so went to my 2nd one. Found out later that what the problem was the cable to the external hard drive and not the drive itself. Luckily I hadn't thrown it out.