Pretty much as the title says, is it possible to set Calibre to automatically create a backup copy of a given .epub file before editing it?
When experimenting, it would be handy to keep the original file untouched.
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Frankly I haven't used the Calibre editor, but I would find hard to believe that it wouldn't. When doing conversions, it usually creates separate directories for source and output. – idiotprogrammer Apr 23 '17 at 17:11
I've contacted Calibre's developer, he said that it is not possible and that he doesn't find such feature useful, so he is not willing to implement it.
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Calibre has a checkpoint feature (Edit > Create checkpoint) that you could use for backups. Simply assign it a keyboard shortcut and press it before major edits. – user4665 May 4 '17 at 12:08
