You may have an event, offer or post that you'd like to clone (duplicate) to more quickly post new content.
It's also great for creating a variation on a theme i.e. a weekly concert event that you want to reuse but simply change the title, picture and band description.
When viewing your Marketing Messages, click Content & Distribution > Marketing Messages, find the post you'd like to clone and click the clone icon.
Then you can edit the post before saving as a draft or publishing.
Please note, you can clone only Events, Offers & Customer Posts - the other posts types don't contain enough reusable information to make cloning valuable.