First of all thank you very much!!
Regarding your first question.
If found it with "find / -type d -name ..... it has been moved to "docker-global" a share if created for docker container. Thank you so much!
Why do I have so many shares?
I didn't know that they are automatically regarded as shares but I also created a lot of shares for different users.
I would like to have a few "public" shares maybe such as "Archive" or even "Minecraft" but each user should have a "Home" It would be nice if Folders under "Home-User1" could be Shares. (I don't know if this is a good idea Synology DSM uses a "Home-System" I like)
Why do you have 325G docker.img?
Because docker containers such as crafty ran out of space, which led to even more problems so I have raised the limit from 250 gb which wasn't enough to 325GB.
I think I have found one big problem. For a lot of containers, I configured them such as here for crafty (Minecraft-Server-Manager).
Why are your docker and VM related files on the array?
Because my cache drive is only 256GB and my two main drives on for parity are both 4TB. I know this is not how i should be doing this.