I just switched from unifi-controller to unifi-network-application while upgrading from 7.x to 8.0.7. Here’s what I used to switch: Unifi Network Application 8.0.7 with mongodb - docker-compose.yml · GitHub
I created a new subfolders “config” and “data” to store unifi config and mongodb database, respectively, then ran docker-compose up -d and waited (after taking down the old stack). Go through the initial setup process on the new instance, then restore from backup, it restarts and after a few minutes you’re good to go.