Not an alternative, but if you want to get a feel for Kubernetes and managing various kinds of servers, check out KubeSail and their options for K8s/K3s It's r

Not an alternative, but if you want to get a feel for Kubernetes and managing various kinds of servers, check out KubeSail and their options for K8s/K3s It's ridiculous overkill, but I'm looking at a NextCloud server on one of their PiBox hardware servers for the house. (You don't need a PiBox - their stuff will run fine on little instances from AWS/DigitalOcean/Hertzner, etc., or a spare PC you have lying around...)