Different backend

In order to change Terraform's backend provider from PostgresQL to something else you need to manually dig into source code and change infra/backend.tf file.

infra/backend.tf

# default
terraform {
  backend "pg" {}
}

For available customization options, please refer to this Terraform's Backend block configuration overview guide.

warning

Keep in mind that default approach uses TF_BACKEND_PG_CONN_STR environment variable to populate backend connection string. If you change backend to different type, you'll have to provide values by yourself.