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					Originally Posted by  pdurrant
					 
				 
				Yes, indeed. It's an iTunes for ebooks. As others have mentioned, it's a good idea to make a backup of your library every so often, as it's good to make a backup of any user-created data. 
			
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 But make your backup while Calibre is 
not running, otherwise it's very likely it won't be correctly backed-up.