Note: You are currently viewing documentation for Moodle 1.9. Up-to-date documentation for the latest stable version is available here: Course files.
If you come to think about it, File synchronization is not needed for activities' student files (for any student files?): they have no "linking" behavior in 1.9, as opposed to teachers, so there is nothing they will miss with the change; they are used to "reselect and resend" when they need to update a file.
This page explains course files in general, but not files associated with the Quiz module. The Quiz module is different because it has a Question Bank (I assume in 2.0). So are media files associated with a particular Question (not quiz)? Are media files backed up with the question item only? How is versioning handled? Now in Moodle 1.9, versioning of questions is handled manually. In our school, teachers save the question as a new question and put their name and date on the new question name. Crude and inconsistant, however.