Hello, Marc. What I recommend to our teachers is to create your own course in your account. (Click courses in the left tab, All courses, and then +Course) Once you're in that course, go into settings and import content. You can import anything you want from your current course to there, and then can just import it all into your courses next year from this "shell course".
Also, if your course is not deleted as of June 3, you still can access the materials in the future, typically. So, in the fall, you'd still be able to import into your new courses that which is in your current course.
I hope that helps!
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