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What has autosaves being done atomically or not have to do with anything? You complained that Sigil and the calibre editor do not allow you to recover a document corrupted by a crash. I explained to you that the calibre editor cannot ever corrupt a document due to a crash.
Once again, there are two totally separate things that you seem to be conflating
1) Protection from file corruption caused by a crash/forced shutdown during a save operation
2) The ability to recover (some) unsaved work
The two have nothing to do with each other.
(1) is irrelevant to the calibre editor, since it can never happen.
(2) is irrelevant to the topic of this thread, since it is not what the OP is asking about.
And while on the subject of irrelevancy, I dont see why this thread belongs in a calibre forum at all. The EPUB in question was corrupted by Sigil and a better place to ask about techniques for recovering corrupted EPUB files would be the forum dedicated to EPUB.
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