You can also download a copy of each book to your laptop/desktop computer, then drag it into Calibre, which creates a separate library for you. This is a large task if you have quite a few books on your device, but once you get it done, it's easy to download each book as you acquire it. The larger retailers provide a bookshelf or account page where you can do this, and smaller ones will email you download links.
Calibre does a great job of collating your ebook collection, using tags and following series. It keeps all your ebooks separately from the shifting sands of directories like My Kindle Content (from which Amazon can delete your ebooks without your permission). So it's a good backup, and a big help in remembering which ebooks you have. It's search is excellent.
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