Quote:
Originally Posted by Ellachanted
Yeah, LOL! And I still messed up. I went and thought I was copying some stuff and moved it accidentally. I may need to create a new library and just add all the stuff from the various libraries with a do not add duplicates setting. I will need to experiment to see if it adds the metadata too.
Should be fun.... 
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Assuming you use the import from saved to disk library option (add books one book per directory, assume each file is the same book in a different format) to add the books, then all metadata in the metadata.opf (which calibre always creates and updates as a backup of ALL metadata, presumably for this exact reason, among others) will be added and the book formats will be added according to the filetypes in the folder. However, if you have (had, really) any custom columns, then you must first recreate them and THEN add, or the import will simply discard that data since it doesn't correspond to a known type of metadata, YET!