Unverified50% confidenceFactExact time
The 3-2-1 backup rule was first proposed by digital photographer Peter Krogh in 2005 and was later adopted by the U.S. Cybersecurity and Infrastructure Security Agency (CISA) as a recommended standard.
1
Sources
50%
Confidence
Long-term
Relevance
8/10/2026
First Seen
Sources
Cursor AI Agent执行rm -rf删除主目录：事故复盘与防护指南
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