Why it matters

DR is compliance + business requirement. Understanding shapes cost + recovery trade-offs.

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The architecture

Backup + restore: highest RTO/RPO. Cheapest.

Pilot light: minimum standby.

Warm standby: scaled-down version.

Active-active: full traffic split.

DR strategy spectrumBackuphours RTO, cheapPilot light / warm standbyminutes RTOActive-activeseconds RTO, costlyChoose based on business impact of downtime + data loss
DR trade-offs.
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How it works end to end

Multi-region: for regional outages. Cross-provider for cloud-wide outages (rare).

Data replication: sync (RPO 0) vs async (RPO seconds-minutes).

DNS failover: Route 53 / Cloud DNS with health checks.

Testing: regular DR drills.