Decision framework
Senior design answer
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Senior DR design starts with business impact, not cloud products.

Pick service tiers and loss tolerance first. Strategy, data design, and test cadence follow from that.

1. Tier servicesPayments and auth do not get the same target as internal reporting.
2. Set RPO/RTOTranslate business impact into explicit loss windows.
3. Choose strategyCold, pilot, warm, or active-active.
4. Prove itRun drills, measure restoration, and refine.
Service tierExampleRTORPOCommon fit
Tier 0Payments / authMinutesNear-zeroWarm or active-active
Tier 1Customer APIs< 1 hourMinutesPilot light or warm
Tier 2ReportingHours1 hour+Backup & restore