RancherOS upgrade removes all Rancher persistence

In my naivity I did an upgrade from RancherOS v1.0.0 to v1.5.0 by executing the commands given here

I assumed it would leave my data alone and just start Rancher after it’d be finished, like it does when restarting the server. However, this doesn’t seem to be the case.

After upgrading the Rancher service wasn’t automatically started, so I did that manually by running sudo ros service up rancher-server.

Is there anything I miss? Is there a way to get my ‘infrastructure’ back?