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DRMless digital is great - I have a calibre library of thousands - but still more vulnerable.
Canticle of Lebowitz is a great post apocalyptic novel. After the nukes, Catholic monasteries preserve the ancient tradition of copying down manuscripts. Text doesn’t require any form of infrastructure.
There are also many texts/other media that are not available in any digital format. Obscure or older. For as much of an Information Age we are in, a lot of knowledge is being lost through neglect.
Remember the meltdown over “Obamaphones”?