Add rate limiting for backup

**Problem**
When working with data, 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 issue does not name files, tests, or an entry point, and its title conflicts with the body: investigate the backup flow and its current error-handling paths first. Clarify whether the desired change is rate limiting, more descriptive errors, or both, then define tests and acceptance criteria before implementation.

Written by the indexing model from the issue text.