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I have not given this much thought as far as books go.
Two sides to it I suppose. Crashes that result in the loss of current data and evolution of software and hardware that makes older data difficult or impossible to access. The first is easy and is solved by a planned backup system. It is easy and cheap to implement with the tiny little book files we are dealing with here. The second is trickier and need constant planning in order to keep migrating your data to new generation media and software during the period when the old and new are both supported. Try not to get left 2 generations behind or you could get into trouble.
That is my plan with photographs anyway. It is helped with images in that it is a widely researched subject with lots of people contributing to working solutions. Not sure that exists for electronic texts at this point but the problem with images that we don't have with books is the huge files now used for images.
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