You can copy any Active or Offline job by clicking on the dropdown menu next to the job posting title and selecting Copy Job. 

This will create a copy of the job and open it in the Edit/Create Job page, where you can edit the details and either Save & Publish or Save as a Draft. If you want to Save it as a Draft and place it online later, simply filter by Offline jobs and then publish the job online by selecting Publish Online from the dropdown menu next to the job title.