Maybe I'm asking a the wrong question or what I think I want can't be done. What I want to be able to do is perform a full backup on day x and then make backups of changes for days X+1 to (say) X+10 then perform a new full backup of day X+11, deleting those files and folders no longer on my system (a Mirror in this case). Then again backing up all changes from day's X-12 to X-21 and then a full backup on day x-22, deleting all files and folders no longer on my hard drive.
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