If there's nothing wrong with what you have, keep it. There's also theoretically nothing stopping you from setting up a similar server and stand up a load bala

If there's nothing wrong with what you have, keep it. There's also theoretically nothing stopping you from setting up a similar server and stand up a load balancer for incoming traffic and use that if you need some redundancy. That's roughly what I do but with docker-compose and a cron job Tooling like Kubernetes might make sense for larger operations but, for me at least, it doesn't seem to make sense and won't make a significant difference in my day to day administration