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3-2-1 backup rule

The 3-2-1 backup rule is an easy-to-remember acronym for a common approach to keeping your data safe in almost any failure scenario. The 3-2-1 backup strategy simply states that you should have 3 copies of your data (your production data and 2 backup copies) on two different media (disk and tape) with one copy off-site for disaster recovery.

from https://www.nakivo.com/blog/3-2-1-backup-rule-efficient-data-protection-strategy/

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