Add unit tests for auth

**Description**
Currently helpers lacks proper backup support.

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

**Priority**: Low/Medium

Start by locating the authentication helpers and any existing unit-test files, then read how backup behavior is currently handled. Clarify whether the intended change is adding tests, configurable backup support, or both; done should include sensible defaults and tests that demonstrate the expected backup behavior.

Written by the indexing model from the issue text.