:: why backup? ::
Take a good look at the photo above. Because right there is why we need to backup. If hard drives never failed, we would never need to backup, and corporations could stop spending millions of dollars per year to backup their data. The truth is, every hard drive will fail at some point. The metal magnetized disks are spinning at about 7200 RPM, and the almost pin sized head that reads and records all of your data floats on a cushion of air above the spinning metal disks. If the head happens to strike the disk while it is spinning, the data at that point is almost instantly destroyed. And that data could be your friends email address, or it could be your "Great American Novel", or all your accounting data.
Modern hard drives are truly amazing feats of science, engineering, and manufacturing. Delicate and robust at the same time. And even so, they are still subject to theft, fire, flood, being dropped, data corruption, virus infection, manufacturing defects, and unforeseen events. One fact I have noticed is that when a modern hard drive DOES fail, there is not much time between the initial failure and COMPLETE failure. This is due to the incredibly close tolerances to which they are constructed. Bottom line, anything important on any hard drive needs to be backed up.
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