If your institution cleans out your course somehow instead of creating a new one, I would export it and save a copy so you can import it when the new school year starts. Our staff gets new courses each year and they import the material from their previous courses.
Here are some great official Canvas Guides that can help you download a copy of your course and then upload your content to a future one.
If your new course(s) are available before your current one(s) are cleared, you could always copy content using the
Course Import Tool as well.