If you have a drip campaign you want to change, but also want to keep a copy of the original, then the "clone" tool is perfect for you!
In your Marketing section, go to the "Auto Pilot Drip Campaigns" tab. Next to the campaign you want to clone, click the "Actions" button and then on "Clone".
Now you will have two campaigns, one named with the original campaign name, and one with (NEW) next to its name.
Now you're free to edit one version of the campaign, and maintain an original copy.