Welcome to the Q&A Forum

Hi there! My name is Erin, and I'm on the Moz Help Team. Thanks for reaching out! If you upgrade nothing will happen to your existing campaigns. An upgrade just increases your limits, and frees up space more more juicy data. You should be good to go! However, if at some point you decided to downgrade, you'd want to lower your limits within your campaigns first. The system won't delete campaigns, but if you downgrade plans before lowering your limits, it will archive certain campaigns so you don't go over your data. I hope that helps, and let me know if you have any other questions! Cheers, Erin