Support backup configuration

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

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

**Priority**: Low/Medium

The issue does not name files, tests, or entry points, and its title refers to backup configuration while the description proposes monitoring. First locate the configuration and monitoring entry points, then clarify the intended scope and defaults with maintainers. Done should mean the agreed monitoring settings are configurable and sensible defaults are covered by tests.

索引モデルが issue の本文から書いたものです。