title_body: Locating or Copying Epubs in iBooks
upvoted_answer: Wouldn't you just be able to use iTunes to copy the file from your tablet/phone onto your desktop? 
  
  It's been a while since I've done it, but after you connect your device and it appears in itunes, you just have to sync it. (I don't think it's going to the cloud, but maybe I'm wrong). 
  
  See: https://www.wondershare.com/ios/how-to-export-ibooks-from-iphone-ipad-to-computer.html
  
  Check out this too: https://apple.stackexchange.com/questions/163131/what-is-the-best-way-to-backup-epub-and-pdf-books-in-ibooks