Backup technology has changed enormously, yet one rule remains where professionals start. In 2026, understanding it clearly is still the foundation of any resilient data protection strategy.
The Rule Restated
Three copies of your data, on two media types, with one offsite. Multiple copies survive individual failures, diverse media survive format-specific problems, and an offsite copy survives a site disaster.
Why It Endures
The failure modes it addresses do not vanish with new technology. Hardware still fails, sites still suffer disasters, and no single copy is ever truly safe.
Evolving for Ransomware
Modern variants extend it. A clear read on 3-2-1 backup shows how added copies and immutability answer a threat model where attackers target backups.
Tested or Untrusted
A rule followed on paper but never tested is false comfort. Verifying each copy restores cleanly is what makes it real.
Still the Anchor
Whatever variant a team adopts, this rule is the anchor the strategy is built on.
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