The 3-2-1 rule recommends keeping 3 copies of data, on 2 different media types, with 1 copy off-site (ideally immutable or offline) to withstand failures and ransomware.
Glossário IT
3-2-1 backup rule
The 3-2-1 rule recommends keeping 3 copies of data, on 2 different media types, with 1 copy off-site (ideally immutable or offline) to withstand failures and ransomware.
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