Lately I moved to a new VPS to get better bang for the buck, old machine is called Carrie, new maching is RBG. I have many different installations, and they each needed different handling.
Using a naiive rsync between the two Debian machines I discovered the hard was that synching over /opt/docker-data (even while both docker and containerd were down) was not working because different versions use different storage metadata formats and such.
You can either export stopped containers, or commit them to images. You can export and import images,