Reading15 min· Lesson 8 of 15

The Immutable 3-2-1 Backup Strategy: Your True Ransomware Shield

How to design ransomware-proof backup architectures and perform regular disaster recovery drills.

1. The 3-2-1 Backup Rule:

  • 3 Copies: 1 primary + 2 backup archives.
  • 2 Media Types: Local NAS storage + Cloud object bucket.
  • 1 Immutable Offsite Copy: Air-gapped or WORM-locked snapshot that attackers cannot delete or encrypt.
Cloud storage server racks
Figure 3.2: Enterprise datacenter backup topologies with write-once retention.
Physical storage NAS hardware
Figure 3.3: Network Attached Storage (NAS) configurations for local snapshots.

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