Digital information can be backup and restored if need be. A paper copy can be damaged and never able to be retrieved. If you have a book that is out of print and you cannot find a copy for sale, then if yours gets damaged, you lose it forever. But if you say backup your ebooks onto say multiple DVD (just to be safe) and store one copy offsite, then if your house blows up, the copy will still be accessible at sometime in the future.
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