This article has nothing to do with genealogy. However, having backup copies of all your important documents, pictures, videos and other items is a must for everyone. I will suggest that having backups of your important data can be a lifesaver.
I believe that everyone should have a MINIMUM of three copies of every digital file that is important: the original file stored in the computer’s hard drive, plus a copy of that file stored on a backup device (hard drive, flashdrive, CD-ROM disk, or whatever you choose) that is stored near the computer for convenience, PLUS AN ADDITIONAL copy or two, stored off-site where the copies will be safe from in-home disasters, such as fire, flood, or burst water pipes.
Three copies are a barebones MINIMUM. For safety, I would recommend even more copies be kept in more locations. Luckily, that is easy to do.