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joining a new version 1.4.0 node to a 1.3 cluster

I think it's not supported

Is there an easy way to migrate from one cluster to another

Harvester hasn't supported full cluster backup yet https://github.com/harvester/harvester/issues/3263 From a VM perspective, you can backup from one cluster and restore it to another https://github.com/harvester/harvester/issues/2237

Backing up from one cluster and restoring to another doesn’t work for me. https://github.com/harvester/harvester/issues/7083

Yeah 1.4.0 was not bale to recognize the 1.3.2 backups, have not had time to investigate either.