In answer to origninal question
Hi pjmpjm. I refer back to your original question, which had also perplexed me (which is how I came to your thread). I had also been perplexed by the $OF folder which is in File Histories directory system and contains masses of material with incomprehensible file names. Apparently the $OF folder is the systems way of dealing with very long file names, as is often the case with ebook file names generated by Calibre. If you haven’t now given up on Windows File History, I’m guessing you will find a $OF folder in there. If you do a search for e.g. *.epub or *.mobi I would predict you will find files of that format with unrecognisable names; and if you open one of these you’ll find it’s an item from your library. My understanding and experience of File History is that on first backup it does make a copy of every file in the specified folders (and subsequently adds newer copies of files that have been edited).
In order to see the full content of your Calibre library in File History do the following:
1. In Windows Explorer click on the folder which contains your Calibre library
2. In the Home tab of the ribbon find and click on History (in the Open group)
3. This will take you into a friendly view of your File History, which hopefully will include everything expected, which you can explore and form which you can potentially restore to the original or a different location.
I hope this helps.
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