In response to the comment: "It's a safe bet that those paper books will last far longer than any hard drive that you store files on"...
Well maintained, redundant archives should last forever - the ability to copy reliably is equivalent to imortality. I have not lost a single file in the last eight years and I have all of my mail going back 20. Devices may and have failed me but my work, letters, photographs and music has survived and grown. They can be passed on to my kids but books will be too bulky for the same. Every library is overflowing with the result of estate overflow. Some put them on the shelf as a "free library" the majority goes to the paper mill to make TP. Such is the sad fate of your paper media and this is why public libraries are important repositories of culture. In the end, not even libraries last forever. All civilizations have their down time and public libraries are often torched. The entire library of the ancient western world, for example, now fits on a single six by twelve foot shelf because the vast majority of it was lost. The US Library of Congres itself is rotting as we speak. Digital libraries will be much hardier than this.
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