When I sync my iPhone with iTunes, are my notes in Notebooks backed up, too?
Every time you sync your iPhone/iPod touch or iPad with iTunes, the contents of Notebooks is backed up as well. Should you ever need to reset or restore the device or if it gets lost and you need to set up a new one, iTunes will restore your books and notes from that backup.
If you want an extra level of security, or if you want to work on your documents from your compter, too, you might consider using any of Notebooks' import and sync methods:
http://www.notebooksapp.com/Notebooks_for_iPhone_-_Help_-_Dropbox.html
http://www.notebooksapp.com/Notebooks_for_iPhone_-_Help_-_WebDAV.html
http://www.notebooksapp.com/Notebooks_for_iPhone_-_Help_-_Import.html