The export/import method is the easiest way to do a complete backup of your library. If you end up wanting to restore it, you have to restore the whole thing though. Is your concern the ability to restore individual books?
Another way you could do it is to create a new empty library (make sure you tick the box saying to use the current library's structure) in a backup location. Then go into your original library, select all your books, right click and choose "copy to library" and send them to your new backup library.
Restoring is just a question of selecting books in the backup library and copying them to the original.
Having just tried this myself I should say that if you're not careful you end up with duplicates. If say you did a dodgy edit on a book and you wanted to restore a good copy from the backup you should delete the faulty one first otherwise you end up with two copies.
So the nice thing about this method is that you have some granularity that's at a lower level than the whole library without manually copying files yourself - so Calibre is updating the database, copying not just the book but the cover file and so on.
The downside is the duplicates and the fact it takes a few more clicks to do.
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