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E-books are just another form of electronic file. If you want to preserve the file for indefinite future use you need to take the same actions you would for digital photo files. Copy them to back-up media (store some off-site) and/or store them in a cloud service.
If you have the file on a single hard drive and it crashes or burns up in a fire it is gone. Depending on where you obtained that file you might also be able to re-download it from the same vendor, assuming they are still around.
If you have a longer view there is yet another task, copying back-up files to current storage media as old ones go obsolete. See any floppy drives (any size) on recent PC's? I consider that dead media. CD-R's are not "dead" yet but they probably will be in less than a decade.
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