Just ran into an nasty problem.
My Sonarr image data kept being reset, so I had to scan the library every day again to reset it.
I also installed Emby, and after a day it would start the wizard again, though not every setting was wiped.
So I was thinking, what happens every day that could cause this? The mover maybe? I have my appdata share setup so it is a regular share that automatically gets moved at night from cache to the array. That way, reads should be fast enough, writes are fast and I have my data safe.
Turns out I was right: by default the path that was given to (some of) my docker containers is not /mnt/user/appdata, but /mnt/cache/appdata! Woops!
I realize many people out there may not run a similar setup as I do, but just wanted to post this as a warning to those that do, so they don't repeat my mistake.