Many thanks.
I indeed have two docker contexts.
$ docker context ls
NAME TYPE DESCRIPTION DOCKER ENDPOINT KUBERNETES ENDPOINT ORCHESTRATOR
default moby Current DOCKER_HOST based configuration unix:///var/run/docker.sock swarm
desktop-linux * moby unix:///home/simon/.docker/desktop/docker.sock
I found a good explanation about the differences between Docker Desktop and Docker CE by you here. I thought Docker Desktop might be an easy solution to do backups of my docker container and volumes, but as it creates a virtual machine its not suitable for me. I will open another thread how to migrate docker container to another host for backup.