Recover from backup maintaining existing cluster scale

This is not a bug. It is more of a feature request / whishlist.

I see [one of the requirements for postgresql charm to be able to restore from a backup is to scale in to a single unit](https://github.com/canonical/postgresql-operator/blob/main/docs/how-to/h-restore-backup.md?plain=1#L5)

Would there be a way to be able to recover from a backup without having to scale in the cluster?

I am mostly thinking about escenarios where scaling in and out again can take quite some time, thus affecting availability, like baremetal deployments and deployments with many replicas