The evolution of cyber threats and operational incidents has rendered the historic 3-2-1 backup rule insufficient. Today, backups are a key element of business continuity and operational resilience: without isolation, immutability, and rigorous recovery testing, recovery capability remains only theoretical. This article takes a technical look at the 3-2-2-1-1-0 rule, explaining why backup is no longer an IT function, but a true business continuity capability.