Yes but op can't use Restore because he was starting from Not having made a full library backup. He is starting from a collection of saved to folder or saved to disc books, I think.
But I am a bit confused , if he used add books to get all those into a new library and selected all formats and include subfolders then he should not have "left over"azw books.
We should probably use the calibre terminology of export, import, rather than say backup, restore Or we may add to the confusion
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