Duplicating Campaigns entails more thought than other duplications in the system. As well as the Campaign itself, you have Leads, Contacts and Companies associated with the Campaign. This enhancement gives you the ability to inherit the audience when duplicating a Campaign, with a few clever options around that.

This is super helpful if you send multiple emails to the same audience, but want to keep your statistics specific to each email, rather than the audience as a whole. Take a look at this FAQ for details on the options available