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"critical" is not a well defined concept. For you a parsing error might be critical because of your use of kepub, for someone else it might not be critical.
If you have a power shutdown or windows crash, while you are editing a book, presumably you will restart your computer and continue editing the book, in which case the check will run automatically the next time you close the book.
There is no loss of undo associated with a save. You can undo or use checkpoints after a save.
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