This is an interesting issue that came up with one of the teachers that I support. She taught a class last year and wanted to save it so that she could refer to assignments that students turned in during the course. So I made a copy of the course, hiding the old copy and resetting the copy that current year students are using. The teacher decided recently to look at some assignments that had been submitted in the course hidden from last year but found that most were gone and there were only a few students that were left enrolled in the course. On investigation, it appears that by default the enrollment setting is set to drop students who are not active for more than 120 days. This makes sense most of the time. But it seems that this may be the reason that most of last year's students are no longer enrolled and their work is missing.
Is there a way to get their assignments back or are they irretrievably gone?
Thanks very much for any help you can give us in this regard.