I literally just upgraded to Unraid 7.0 from 6.12.14 and it took about 5 minutes with a restart. After the restart, my server came back up without any errors. I checked all my docker containers to make sure they started up properly and were accessible. All of my containers were fine. All of my plugins with the exception of NerdTools were fine. I received a update notification from the community app store for NerdTools and that update notification was to actually uninstall NerdTools. its deprecated in Unraid 7, but that solution was easy. There's another plugin in the community store called 'Python3' and it works as a nice replacement for NerdTools and its compatible with Unraid 7. In case you guys are interested, I run 14 docker containers that include the following:
Immich
Overseerr
Plex Pass
Qbittorent
Sonarr
Radarr
Prowlarr
Gluetun
flaresloverr
Postgres Backup
MySpeed
Krusader
All containers started up without any issues and are fully accessible. My array is also up and running without any issues. My NVMe cache drive appears to fine and also my NVMe appdata drive appears to be fine as well. I'm actually pretty impressed with how smooth and quick the upgrade went. I was a little nervous to upgrade after reading a few horror stories from others about past upgrades, but so far, the success stories about upgrading to 7.0 seem to be true. It was absolutely painless.