It's interesting skopeo [1] hasn't popped up in this discussion, partially because it is part of redhat's container tools along with podman, and partially because although it started out as a tool to examine remote containers it too supports container migration, but not just between registries.<p>From the linked website "Skopeo is a tool for moving container images between different types of container storages. It allows you to copy container images between container registries like docker.io, quay.io, and your internal container registry or different types of storage on your local system". Perhaps redhat plan to roll up skopeo functionality into Podman at some point?<p><a href="https://www.redhat.com/en/blog/skopeo-10-released#:~:text=Skopeo%20is%20a%20tool%20for,storage%20on%20your%20local%20system" rel="nofollow">https://www.redhat.com/en/blog/skopeo-10-released#:~:text=Sk...</a>.