by Mark Pearson.
Bernard,
If you're moving the course to a version 2 site then just uncheck Attendance in the backup process on the 1.9 system and do the course backup. There's nothing to be gained from backing up/restoring Attendance anyway. None of the user data will transfer and all the session information would be stale and need recreating. Far better to start from scratch and add and configure Attendance in the newly restored course in the 2.x system. Ditto for the News forum -- I never backup that one because it merely ends up duplicating on the newly restored course.
Here's a document I wrote for adventurous users to transfer their own courses. It probably has limited applicability for you though.
Mark