Add configuration options for backup

**Problem**
When working with core, the error messages could be more descriptive.

**Suggestion**
Improve error handling and add detailed error messages.

**Context**
This would help with debugging and maintenance.

The payload names no files, tests, or entry points. Start by locating the core error-handling paths and review how current errors are surfaced; clarify the required configuration options and expected message details before changing anything. Done means the agreed error cases provide more descriptive messages and are covered by tests.

Written by the indexing model from the issue text.