Why would I write such an article? Mainly because I have experienced with what I am about to write about.
Did you ever do a backup of files, email or pictures only to find out they weren't really backed up. I have and so have many of my clients.Tape drives, DVDs, CDs and even USB drive can fail. You should periodically test the backups to be sure they are actually working. Either the drive itself can go bad or the tape itself or other media.
Another problem is that they may not be backing up what you think they are. They may not even be backing up to the chosen drive or location you want them to. This could be because you configure it wrong or just because the software is defective.
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