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The 3-2-1 backup rule, explained simply
The best-known rule in data protection — and why, in the ransomware era, it needs an upgrade to 3-2-1-1-0.
If you remember only one principle about backup, let it be the 3-2-1 rule. It is simple, memorable, and has saved countless organizations from permanent data loss.
What 3-2-1 means
- 3 copies of your data (production + two backups)
- 2 different storage media types
- 1 copy kept off-site, in another location
Why it is no longer enough
Modern ransomware actively seeks out and encrypts backups. That is why we recommend extending to 3-2-1-1-0: one immutable or air-gapped copy, and zero errors on recovery testing.
- 1 immutable (WORM) or air-gapped copy
- 0 errors — verified through regular recovery testing
Takeaway
A backup that has not been tested is not a backup — it is a hope. Root Security implements and tests 3-2-1-1-0 strategies for organizations across Romania.