Possible to move volumes between clusters?

My jupyterhub cluster started floundering, and in an attempt to upgrade kubernetes and increase the number and size of master nodes, the cluster got… Severely Borked (etcd can’t mount it’s volume on 2/3 masters, they have different PKI keys than the working master, which is only working because I ssh’d into it and changed its API server manifest–it’s a mess)

I feel like the only option now is to take off and nuke the whole site from orbit, but the last time I had to do that it clobbered the (Aws ebs) user storage volumes. Is there a way to save those, perhaps by starting a new cluster and moving them over, or some such? I’d hate for people to lose their work… And as much as I love kubernetes, I suspect the ability to recreate the cluster without losing user storage would be a really valuable skill…