I suspect you would get better mileage out of a versioned snapshot system similar to the example I mentioned in post #7
Rather than simply maintaining x versions and firing off a backup script to rotate it, this would create a Time Machine in which you can go back and restore any files you need. The main thing is though, that if nothing changed you do not keep multiple copies, but simply hardlink one copy to multiple locations.
Anyway, using timestamps (like the example) is not only more descriptive, it also reduces the needed commands to two. One to create a new backup, the other to delete all files older than x. (we assume you will notice the problems sometime within a month.)
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