Would it cost more to shorten the backup period? And is there a way to offline the server backup..? Your worrying about losing the archive of 10 years or more leads me to believe there may be no server independent backup, right? Perhaps the members here could help you out by sponsoring the purchase of a multi-terabyte sized HD for offline server storage?
I can only imagine what a loss to the community having the last decade or so evaporate into the ether would be!
All of us appreciate how much effort and worry you must have gone through here.
How can we help?
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An arranger is just a tool. What matters is what you build with it..!