The Copy course feature allows you to copy all or part of a course to another (empty) course. To use it, you first need to have another course available to copy it to.
From the Backup page:
click Copy course,
select the destination course
select the elements to copy (all or part of the origin course)
select what to do when the files in the destination course already exist (rename or overwrite),
click the Copy course button.
Note : A message will confirm if the course was successfully copied