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I must say that I don't find Calibre's "save to disk" feature all that useful. Why? Because it's a real PITA to import books back into calibre from such a folder.
It's much better to just make a manual copy of the calibre library altogether (copy-paste the entire folder) as a backup.
For me, the "save to disk" feature is only useful if you want to move to a different ebook manager, or to have some peace of mind if you fear that calibre will dissappear sometime...
Hence, I only do a "save to disk" backup once in a blue moon, whereas I manually copy my calibre library folder quite often.
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