- Add backup settings to ProjectSettings with schedule, retention, and directory config
- Create BackupManager with create, list, cleanup, and restore operations
- Add CLI backup commands: --create, --list, --restore, --cleanup
- Implement backup validation and automation sync for scheduled backups
- Add dashboard backup settings UI with stats and 'Backup Now' button
- Add backup API routes for settings management and manual operations
- Include comprehensive backup tests and changeset for patch release
- Document backup configuration and recovery in AGENTS.md
