Operator 2.3.002 does not support "backup" service

How should the backup service be added to a couchbase cluster that is deployed using the operator?
Because the operator does not support adding the “backup” service.
This seems odd.

The CouchbaseCluster “cb-cluster” is invalid: spec.servers.services: Unsupported value: “backup”: supported values: “admin”, “data”, “index”, “query”, “search”, “eventing”, “analytics”

We don’t use the backup service for now, as that would be neither particularly resource, nor cost, effective. Backups are run via a cronjob (which is effectively the same as the backup service, but done in a idiomatic Kubernetes fashion).