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'I have a backup' isn't enough — only a backup you've verified you can restore is real. The basics: the 3-2-1 rule (three copies, two media types, one offsite). For ransomware you also need at least one 'offline or immutable' copy — an always-connected backup gets encrypted along with the original. Cloud sync is not a backup (it replicates deletions and encryption too). Versioning and a periodic restore test complete the practice.