We had a situation where an instructor meant to import their course content into next terms course but accidentally imported the content onto the same course thus wiping out all the student grades, submissions, quiz data, and discussion prompt content. I was able to download the content from the Beta Environment, but there needs to be a permission restriction so teachers cannot do this by accident or there's a way to restore a previous version of the course with the submission, page view and interaction data intact. Canvas Support said there is no way to fully restore the course with the student data and grading work intact.