If you don’t want to pay a subscription for cloud storage you can use the technique mentioned by Sirtel to mirror it to a usb drive. Those drives a very inexpensive and will easily hold the entire library of thousands of books.
You can either just copy the folder that holds your books to the usb, or other external, drive - OR - you can use Calibre’s LibraryExport function. That function makes a Calibre restorable folder you typically use if transferring your library from one computer to another. It’s a larger folder than just copying the library folder, but it still easily fits in a usb drive.
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