What is the recommended way to make a backup of all the books I have purchased with Apple books (formerly known as iBooks), preferably using macOS?
Or may there is even an official way recommended by Apple?
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Apple’s recommended method for any local backups is Time Machine. While other options exist, none of them match your combined wishes in question.
When you select the options for the book (
...), you can
Share PDF and simply e-mail it, save to files, etc.