Thank you all for your responses.
Dwanthny,
I did read the new features, but not careful enough. Indeed, my mistake.
So I knew there would be a backup file, but I did not realize the backup would always automatically be used as a source for a conversion.
Well, I sure learned the hard way.
I'm, still recovering from the shock of loosing many days of hard work.
I like the backup feature, but perhaps it would be nice if calibre asked what file to use for a new conversion in case there are multiple files of the same book in the library.
That would be best of both worlds I think, because that way you can add to previous changes, or you can make a completely new conversion from the start.
For now, I have disabled the backup feature.
I already keep multiple backups of my libraries.
So I do not need the feature.
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