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Media Rotation Tradeoffs
The reason that there are different rotation schemes is that there are different systems, and different people who use them, and therefore different needs. The backup requirements of a home PC are very different than the server for a business. There is also a matter of media cost, which in turn depends on the type of backup being done. In general, these are the tradeoffs:
Warning: Under no circumstances
should you use only one media set when performing backups. The risks to this data set are
large and the protection you are getting from your backups is going to be severely
compromised by this decision. One of the most common problems with doing this is the
possibility of a hard disk crash or power spike during a backup itself; if this happens
you could easily lose both your system and backup at the same time. While any backup is
better than none, this warning falls into the category of "if you're going to do it,
you might as well do it properly".