This is often stated as the 3-2-1 rule. At least: 3 copies, 2 different kinds of... | Hacker News

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		ska on June 25, 2021 \| parent \| context \| favorite \| on: WD My Book users wake up to find their data delete... This is often stated as the 3-2-1 rule. At least: 3 copies, 2 different kinds of media, 1 copy offsite.

steveBK123 on June 25, 2021 [–]

also different methods/software is important as you never know what bug may be lurking leading to bad backups

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