When you're making changes to an already published Amped Campaign, you will be give two options.
Create a new draft
Make a quick edit
Why would I want a new draft?
Amped Campaigns work in "Versions" which allows you to track creative performance and run split tests. Editing in a "draft" fashion is something you're likely very familiar with already. Drafts need to then be published for them to go live (And the Campaign has to be set to "Active").
Here's and example of a Campaign which you might be setting up a few variations for the split test and you're almost ready to launch:
