Matches the master's tokenless-push change: pushBackup no longer waits for master_backup_token — every instance with a uuid backs up on its own, and the 5-minute tick force-pushes so a poisoned master copy self-heals. The token now only gates pulling a backup back (restore), so setup-linux.sh asks for it only when restoring and the Settings help text says so. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>