Although iTunes is very helpful to transfer files, you cannot backup non-purchased books from your iPhone to iTunes library through iTunes. Why? You should know that iTunes can only transfer files from iTunes library to iPhone only. That's to say, you cannot transfer books that are downloaded from the Internet to your iTunes library through iTunes. However, if you still need to transfer books from iPhone to iTunes, you can turn to another third party tool for help.
I suggest you to try a very powerful iPhone transfer tool – FoneTrans. With help of the program, you can view all books, as well as videos, photos, music and more directly through the program and choose to transfer the ones you need from iPhone to your iTunes. During the process, all existing files on your iPhone won't be changed.
Good news for you! We now offer you free trial version of the program to have a try before you purchase it. Then please install it on your computer and run it to bring up the starting window. You can now choose either Windows version or Mac version according to system of your computer. I will show you how to complete the task with the program step by step, please follow me to have a try.
After launching the program, you can see starting window of the program on the screen of your computer. Please then connect your iPhone to computer via a USB cable, the program will detect your iPhone immediately and then display it in the starting window.
A few seconds later, the program will finish scanning your iPhone and classify all files into different categories in the left side column of the starting window. To transfer books to your iTunes library, please click “Books” to bring up all books on your iPhone. You can choose the books you need to transfer in the new window, then please click the button “To iTunes”. The program will transfer them to your iTunes library automatically.
In addition to syncing iPhone books, you can also transfer other files to your iTunes, such as videos, photos, music and more at the same time.
Congratulations! Now you can check your iTunes library to find the added books easily. You can also find that all former files still exist on your iPhone! Just download FoneTrans to have a try now!