Aloha,
I would like to turn off iCloud Drive.
But I activated in iBooks iCloud Drive.
Now I don't see any "official way" to export all MY books out of iCloud drive.
The only way I currently found is to use terminal and make a
cp ~/Library/Mobile\ Documents/ibooks~apple~com/ ~/Documents/MYbooks/
Best Answer
You can always drag-and-drop your .epub and .pdf files from iBooks.app onto your Desktop or any other folder.