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I don't know about the blue book icons, that depends on which application you have registered to open certain book files, but the easiest way to back up both books and metadata would be to backup the entire Calibre library folder including the metadata.db file. That way, if you ever manage to blow up your library, you can revert to the state you backed up simply by deleting the contents of the library folder Calibre is currently using and copying in your backup.
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