You can easily copy a sent or draft campaign using the Duplicate option.
Go to your Campaigns page and click on the ‘Sent’ tab or the 'Draft' tab.
Find the campaign you want to duplicate, click on the cogwheel and then 'Duplicate'.
On the Campaign details page on the newly duplicated campaign, you can change the newsletter details, edit the design, or simply click 'Back to My Campaigns'.
Find the campaign you want to duplicate, click on the cogwheel and then 'Duplicate'.