Closes#590
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
* **Tests**
* Enhanced test coverage for backup pattern handling and anchoring
* Added end-to-end scenarios validating include patterns, exclusion patterns, and exclude-if-present functionality
* **Refactor**
* Updated pattern processing logic to improve relative path resolution for backup patterns
* Improved asynchronous handling in backup initialization workflow
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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