You need not keep e-books on your e-book reader to access them. Instead, by choosing the option “Remove from device,” you can un-clutter your reader. Even upon doing so, books you have purchased from Amazon are archived on the company’s servers and still available from your account to be downloaded again should you ever decide you want to reread them. You can find the books in the Archived Items area on the home screen. You can also see all the books you have purchased and archived by logging into your Amazon account.