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# Tier 0 Tier 1 Tier 2 Strategy

> Depth-first rabbithole dossier for Tier 0 Tier 1 Tier 2 Strategy; source-anchored research pack.

Parent: [MongoDB Atlas Cost Optimization](https://llms-explorer.com/tree/mongodb-atlas-cost-optimization/) · 2 facets · 4 facts · page: https://llms-explorer.com/tree/tier-0-tier-1-tier-2-strategy/

## Measurements and reference values

- [high] Tier 0 strategy targets highest criticality applications requiring fully-automated failover during regional outages, demanding SLOs above 99.99% with RTO in seconds and RPO approaching zero. Sources: https://www.mongodb.com/docs/atlas/architecture/current/deployment-paradigms.md, https://learn.microsoft.com/en-us/azure/well-architected/design-guides/disaster-recovery — source: `~/.global-ai-hub/research/.pipeline/mongodb-2026-10-14/frb/tier-0-tier-1-tier-2-strategy-a8132f2f97/rabbithole-synthesis.md#core`
- [high] Tier 2 strategy targets lowest criticality applications that can be down for 24 hours without significant revenue impact, with an RTO above 8 hours (Atlas deployment paradigms); Azure's comparable Business Operational tier targets SLOs around 99.9% with RTO and RPO in hours, while SLOs below 99.9% and RTO of hours to days describe Azure's Tier 3 (Administrative). Sources: https://www.mongodb.com/docs/atlas/architecture/current/deployment-paradigms.md, https://learn.microsoft.com/en-us/azure/well-architected/design-guides/disaster-recovery — source: `~/.global-ai-hub/research/.pipeline/mongodb-2026-10-14/frb/tier-0-tier-1-tier-2-strategy-a8132f2f97/rabbithole-synthesis.md#core`

## Facts and statements

- [low] Tier 2 (Business Operational) optimizes costs by using cold standby setups and pay-as-you-go options like spot instances and consumption pricing. Sources: https://learn.microsoft.com/en-us/azure/well-architected/design-guides/disaster-recovery — source: `~/.global-ai-hub/research/.pipeline/mongodb-2026-10-14/frb/tier-0-tier-1-tier-2-strategy-a8132f2f97/rabbithole-synthesis.md#core`
- [low] Tier 3 (Administrative) prioritizes cost savings by relying on backup and archival storage with longer recovery windows. Sources: https://learn.microsoft.com/en-us/azure/well-architected/design-guides/disaster-recovery — source: `~/.global-ai-hub/research/.pipeline/mongodb-2026-10-14/frb/tier-0-tier-1-tier-2-strategy-a8132f2f97/rabbithole-synthesis.md#core`

## Related concepts

- Tier — is a part of Tier 0 Tier 1 Tier 2 Strategy
- Strategy — is a part of Tier 0 Tier 1 Tier 2 Strategy