Hi Derek,
I tried to reset, but the students submissions in the workshops did not reset. I read a bit in moodle docs and realised that unfortunately the Workshop plugin does not reset. Forums, assessments, etc does reset and remove previous students submissions. But not workshops. So on one of the forums I read a comment that the only way you can 'get rid' of the old submissions is to restore the course from a backup before you enrolled any students.
Hope this make more sense.
And yes, I lost all the backups. When I access my back up files, all the other courses backups are there, except this one course that I restored.
Thx