They are only backed up in iCloud as part of your overall iCloud iPhone backup. And they can only be accessed from the backup by restoring the entire backup to your phone. To back them up, import them to your computer as outlined here: http://support.apple.com/kb/HT4083.
This site contains user submitted content, comments and opinions and is for informational purposes only.
Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site.