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Adds cloud sync extension to the daily backup script using rclone with client-side AES-256 encryption. Includes interactive setup script for configuring OneDrive, Google Drive, or any rclone provider. - scripts/setup-rclone.sh: interactive NAS rclone installer + config - scripts/cloud-backup.sh: sourced by backup.sh when CLOUD_ENABLED=true - backup.sh: cloud sync step runs after local backup Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>