> consider the cost of maintaining an OSS ClickHouse cluster
I mean... it is pretty straightforward. 40~60 line Terraform, Ansible with templates for the proper configs that get exported from Terraform so you can write the IPs so they can see each other, and you are done.
What else could you possibly need? Backing up is built into it with S3 support: https://clickhouse.com/docs/en/operations/backup#configuring...
Upgrades are a breeze: https://clickhouse.com/docs/en/operations/update
People insist that OMG MAINTENANCE I NEED TO PAY THOUSANDS FOR MANAGED is better, when in reality, it is not.