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3-2-1 Backup Rule
Definition
(Context: Technology Management)
A fundamental backup methodology that requires at least three total copies of data:
3 includes: one live production copy and two backup copies, 2 of which are local but on different mediums/devices represents two different media/methodologies, and 1 represents a single off-site copy to support disaster recovery.
Reference:
EA-Solution-Data-Availability-Requirements.pdf (virginia.gov)
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