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Those contain backups of the metadata, and if you see them in the calibre library folders, don't touch them.
Best case scenario -- calibre recreates them.
Worst case scenario -- calibre loses metadata permanently. (You can always recreate it however you got the metadata in the first place. Metadata downloads/extract from ebook files -- mmm, fun.)
If those are in an exported folder, you can probably delete them. There is an option to not save them in the save to disk settings.
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