Improve error messages in config

**Description**
Currently controllers lacks proper backup support.

**Proposed solution**
Add configurable backup with sensible defaults.

**Priority**: Low/Medium

Start by locating the controller and configuration entry points related to backup support; the issue names no files or tests. Clarify whether the goal is improved config errors, configurable backups, or both, then define done as working backup configuration with sensible defaults and coverage for the resulting behavior.

Written by the indexing model from the issue text.