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@Bouboule - The question you must as yourself is: "Once I add a book to calibre, why do I need to keep the copy of the book file elsewhere?"
Most (all ?) book stores keep a record of your purchases and they allow you to download the book again, and again, and . . .
I keep incremental backups of all my data, including calibre libraries, on a local USB 3.0 disk drives (daily), and on a cloud service (weekly).
BR
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