If you want to have a separate, individual course forum in each course, the backup once, restore multiple times. Or if you have the sharing cart installed, use it to place in every course.
If it is okay to have just one forum used by EVERY course, create the forum in the Main Menu on the front page. Then configure the Main Menu Page contexts to, Display throughout the entire site.
If it is okay to have just one forum used by EVERY course, create the forum in the Main Menu on the front page. Then configure the Main Menu Page contexts to, Display throughout the entire site.