Quote:
Originally Posted by Penforhire
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.
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Very important point. Backup always and often.
Personally I backup to a USB flash drive (almost daily) and DropBox (my Calibre library syncs there) and to a USB hard drive and other media (such as DVD) less often, but usually monthly.