Disaster Recovery on the Cloud: Resilience Without a Second Data Center
Keeping a secondary data center just for disaster recovery is expensive and often under-tested. This paper shows how cloud-based DR delivers tiered, testable recovery at a fraction of the cost.
1Challenge
- Costly idle capacity: a secondary site holds hardware, licenses and facilities that sit unused most of the time.
- Untested plans: DR runbooks go stale and are rarely exercised end to end, so actual recovery times are unknown.
- Ransomware: modern attacks target backups and replicas, so traditional DR may not cover cyber recovery.
- One-size-fits-all: every system gets the same protection, regardless of business impact.
2Solution
Tier recovery to business impact
| Pattern | How it works | Best for |
|---|---|---|
| Backup & restore | Backups copied to cloud storage; environment rebuilt on demand | Non-critical systems with RTOs of a day or more |
| Pilot light | Data replicated continuously; minimal core services running, scaled up on failover | Important systems with RTOs of hours |
| Warm standby | Scaled-down but fully working copy always running | Critical systems with RTOs under an hour |
| Active-active | Workload served from multiple sites at once | Systems that cannot tolerate downtime |
Build it right
- Replication with native services (Azure Site Recovery, AWS Elastic Disaster Recovery, OCI Full Stack DR) and database replication (Data Guard, Always On, PostgreSQL streaming).
- Infrastructure-as-code so recovery environments are rebuilt the same way every time.
- Immutable, isolated backup copies and a clean-room recovery process for cyber incidents.
- Automated runbooks covering DNS, networking and application start-up order.
- Scheduled DR drills, from tabletop to full failover, with timed RTO/RPO results.
3Results
No second data center
Pay mostly for storage and replication, and for full compute only during drills or real events.
Measured recovery
Regular drills turn RTO and RPO from assumptions into tested facts.
Cyber resilience
Immutable copies and clean-room recovery address ransomware scenarios.
Right-sized protection
Each system gets protection matched to its business value.
This white paper is general, educational guidance. Results depend on each organization's environment, contracts and scope. Product names are trademarks of their respective owners and are used for identification only.
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