In a recent article, OS X 10.9 Mavericks: Where Did My Books Go?, I pointed out that iBooks moves your ebooks from your iTunes Media folder to a somewhat hidden folder in your user account’s Library folder. At the time, I thought that there was no easy way to get a copy of a book from the iBooks library, but I realized that I was mistaken.
Taking a clue from iTunes, I dragged a book from the iBooks app to a folder. Just as with iTunes, when you drag content from the app, it copies to the target location. So, if you want to get a copy of a book from your iBooks library, just drag it to your Desktop, or to a folder. It will look as though you’re removing the book from iBooks, but that’s not the case; the green + cursor shows that it is making a copy.
Note that these books will have a generic iBooks icon, and will not show the cover that the book displays in iBooks. Also if you’ve chosen to organize your books manually, you’ll find that they jump around quite a bit when you drag a book like this.
However, you can use this technique to make a backup of your iBooks library, with the files containing the names of your books. Just open the iBooks app, press Command-A to select all of the books, and drag them to a folder. All the files will copy, and will be named with the books’ titles.