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The Dead Sea Scrolls is an example of "only one back-up made".
The entire 1890 US federal census was destroyed in a fire at the turn of the century -- no back-up, all records lost forever in one blaze.
There is value in this back-up project. It is why all archives are created: to have access "in perpetuity" to the stuff of the past. The electrons are important, but so if the ability to handle the things, quite apart from the data content.
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