Verified65% confidenceFactExact time
The 3-2-1 backup principle was first systematically articulated by photographer and author Peter Krogh in his 2005 book The DAM Book.
3
Sources
65%
Confidence
Long-term
Relevance
7/7/2026
First Seen
Sources
Discs Die Too: The Truth About Digital Storage Lifespan and Backup Strategies
hackernewshackernews7/4/2026
Related Claims
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