Before purchasing audiobooks on iTunes, you might want to look into other alternatives. You have to be aware that these aren’t supported files for iCloud sharing, unlike other iTunes downloads. Also, you can only download the same audiobook once from Apple. Find out more about iTunes audiobooks in Andrew Kunesh’s post for macgasm.net.
Source: http://www.macgasm.net/2013/04/03/psa-itunes-audiobooks-are-not-backed-up-to-icloud/
