As C Behan already mentions, the following content of the following activities is only included if the student data is included in the backup file: Glossary, Wiki (I think), Database. This has to do with the fact that every entry a participant makes in these activities, is considered user-related data, and not course-related.
For Glossary, you'd have to export with XML, for Database, you'd have to use any of the export formats avaiable.
For Glossary, you'd have to export with XML, for Database, you'd have to use any of the export formats avaiable.