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If you hover the mouse on a book cover it will show the path to the cover.
The current library cannot be removed - i.e. it won't appear in the Remove libraries list.
Try creating symbolic links to the backup libraries with different names e.g. the symlink that references a backup of your Books library might be named BooksBackup. Then if you point calibre at a symlink to a library it will use the symlink name - so, you'd see a Books library, and a BooksBackup library.
BR
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