Add configuration options for backup

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

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

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

No files, tests, or entry points are named. Start by locating the authentication error-handling code and existing error-message tests, then define the affected cases and verify that the resulting messages provide more debugging detail without changing unrelated behavior.

Written by the indexing model from the issue text.