makomweb/dr-failover-strategies.md

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DR failover strategies

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dr-failover-strategies.md

🟢 = running ❌ = not established | not running

strategy	RPO	RTO	tiers	availability target	note
backup + restore	3h ≤ RPO	3h ≤ RTO ≤ 2d	DB ❌ app ❌ DNS ❌	99%	cheapest + max. ops
pilot light	5min ≤ RPO ≤ 3h	10min ≤ RTO ≤ 3h	DB 🟢 app ❌ DNS ❌	99.5%	app must be booted + scaled
warm standby	5sec ≤ RPO ≤ 15min	1min ≤ RTO ≤ 15min	DB 🟢 app 🟢 DNS ❌	99.9%	app tier scaled down
hot standby	5sec ≤ RPO ≤ 15min	10s ≤ RTO ≤ 10 min	DB 🟢 app 🟢 DNS ❌	99.95%	app tier ready to take traffic
active/active	~ 0s	~ 0s	DB 🟢 app 🟢 DNS 🟢	99.99%	most expensive + minimal ops

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