I was running out of space in the cloud. I deleted books I had already read (much better idea to create a separate library, and not have it back up to the cloud. I actually reread a book I gave 2 stars to 3 years ago). Now, I keep 2 copies if it is an epub book, and 1 if it is mobi. Since I always convert my mobi books (just to make sure the DRM removal is working) I go back in and delete the original file (AZW or Original Mobi), because I can always redownload it from Amaaon.
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