We currently have jupyterhub-ssh the Python package + Helm chart, and we have the jupyterhub-sftp part of that Helm chart that could in practice be its own Helm chart.

@yuvipanda describes that even if we solve #41, using rsync like that won't be very performant. Perhaps could the jupyterhub-sftp service be made more general, such as jupyterhub-filetransfer and be a service directly exposing some file transfer services like rsync, scp, and sftp? Maybe... Let this issue represent the wish for having a performant rsync.