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Hmm, interesting point -- checkpoints are saved within an editing session. Although not restored next time you edit, the info should still be accessible in the working directory, which is located in %TEMP% -- on Windows, this isn't (usually) cleared on reboot.
So if someone was using calibre's editor, the book could probably be restored, with work (mostly searching for the right folder), from the unpacked checkpoints directories.
Sigil doesn't use checkpoints, although it might have the same unpacked Tempfiles storage, I don't know -- I haven't used it in a while, and I never checked. Either way, the corruption might have affected those files as well -- but not calibre's checkpoints, which wouldn't be written to.
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