Add rate limiting for backup

**Description**
Currently middleware lacks proper monitoring support.

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

**Priority**: Low/Medium

Start by locating the backup middleware and any existing monitoring or configuration entry points. Clarify whether the requested change is rate limiting, monitoring support, or both, then define sensible defaults and verify the resulting behavior with the relevant checks or tests.

Written by the indexing model from the issue text.