System Design Fundamentals
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Data Backup vs. Disaster Recovery

Replication protects you from losing a machine. It does not protect you from an engineer running a delete against production, or from a fire in the building, because a replicated system copies the mistake to every replica just as faithfully as it copies everything else.

That is what backup and disaster recovery are for. They are related, they are often discussed together, and they are not the same thing.

Data Backup

Data backup is the process of creating copies of data so it can be used if the original is lost or damaged

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