If you would like to duplicate your course, you can do this by going to your Course Dashboard and Actions.
Select Copy Course. You can then select the destination space for the duplicated course using the dropdown. Copy your course by selecting Copy course.
The course and all the modules will now be copied to the new space. Student progress will not be copied and the course will be created as a draft. This can be published when you are ready. The course name will say Course Name (copy) but this can be changed in the course settings.