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Backup & Data Protection

Why RAID is not a backup, and what is: the 3-2-1 rule, snapshots, rsync jobs, and an offsite copy that survives a fire.

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Glossary terms

3-2-1 Backup
Three copies, two media, one offsite.
Snapshot
A point-in-time, space-efficient copy of a volume.
rsync
A tool that syncs files by copying only what changed.

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