@Stormryder: thanks. I did it like that.
I get a empty folder 'plugins' and domoticz.db (+ .db-shm and .db-wal).

But when i want to execute a script with a virtual switch i get an error:
Error: SQLHelper: Error script not found '/opt/domoticz/userdata/scripts/hs/hsDomCopy.py

Adding /scripts/hs ...

I am a still confused. This is my screen. Is this the correct way?

@waltervl: yes.

@waltervl
No i did not use composer. I used the docker ui on the synology box to create a container. So i have to use the fields presented.
I dir see it in the documentation you mentioned. But i can not deal with it.

Sorry if this is the wrong place to ask this question.
But i try to install this official docker image in a container on my synology nas.

I can get Domoticz up and running and restore the database from my current Pi implementation. All devices are present.

The only thing i can not get to work (so ...