Use data of another instance

I’m looking for a way to use the data from another stolon instace. I’ve tried scaling down, copying over the data and scale up again. Seems to complain about some wrong id. After destroy and recreate I ended up with an empty db twice.

How can I use the data from another instance?
I’m trying to use stolon together with local-path-provisioner and need to destroy and recreate a few of my stolon instances to be able to scale my entire cluster to 1 specific node. More info: provisioner doesn't like when nodes go away, VolumeFailedDelete · Issue #31 · rancher/local-path-provisioner · GitHub

How can I use data from another instance?
Anything I’m doing wrong here? These things seem a bit cumbersome.