Active-active gives the fastest recovery and the hardest operating model.
Multiple regions already serve real traffic. Disaster recovery becomes traffic redistribution, but consistency and split-brain protection become first-class design problems.
0?
Benefits
- No wait to build or boot the second site
- Traffic can shift immediately when one region degrades
- Higher availability during normal operation
Costs
- Cross-region state coordination
- Conflict resolution and quorum design
- Capacity planning for one-region survival
Near-zero RPO/RTO is usually not a product choice. It is a distributed-systems commitment.