Estimate disaster recovery infrastructure costs including DR compute, storage replication, network, and testing. Budget for active-active or pilot light DR.
Disaster recovery (DR) infrastructure ensures business continuity when your primary environment fails. The cost of DR depends heavily on your chosen strategy: backup-and-restore (cheapest), pilot light (moderate), warm standby (expensive), or active-active (most expensive).
A pilot light DR setup keeping minimal infrastructure running in a second region might cost 10–20% of your production environment. A warm standby running scaled-down replicas costs 30–50%. Active-active (full redundancy) effectively doubles your infrastructure cost but provides near-zero RTO.
This calculator estimates the monthly cost of disaster recovery infrastructure across four components: DR compute (standby servers), storage replication, network connectivity between sites, and regular DR testing. Use it to balance your recovery objectives (RPO/RTO) against your budget.
Integrating this calculation into monitoring and reporting workflows ensures that engineering decisions are grounded in real data rather than assumptions about system behavior. Precise measurement of this value supports informed infrastructure decisions and helps engineering teams optimize system architecture for both performance and cost efficiency.
DR is insurance for your business, and like all insurance, the cost must be balanced against the risk. This calculator helps you quantify the monthly ongoing cost of your DR strategy, making it easier to justify the investment to stakeholders or identify cost reduction opportunities. This quantitative approach replaces reactive troubleshooting with proactive monitoring, enabling engineering teams to maintain service level objectives and minimize unplanned system downtime.
Total DR Monthly = dr_compute + dr_storage + dr_network + dr_testing DR Percentage = (DR Monthly / production_monthly) × 100
Result: $2,400.00/month
Pilot light DR with minimal EC2 instances ($1,500/mo), cross-region S3 and RDS replication ($400/mo), VPN to DR region ($200/mo), and quarterly DR test drills amortized monthly ($300/mo). Total: $2,400/month. If production costs $12,000/month, DR is 20% overhead.
For a $10,000/month production environment: Backup-and-restore costs $200–500/mo (storage only), RTO 4–24 hours. Pilot light costs $1,000–2,000/mo, RTO 10–30 minutes. Warm standby costs $3,000–5,000/mo, RTO 1–5 minutes. Active-active costs $8,000–12,000/mo, RTO near-zero. Choose based on your RTO/RPO requirements and the hourly cost of downtime.
AWS DRS replicates servers continuously for $0.028/hr ($20.44/mo) per server plus staging storage ($0.025/GB gp3). For 10 servers with 500 GB each, DR costs roughly $329/month. During failover, production-sized instances are launched on-demand. This is significantly cheaper than maintaining standby instances.
Document runbooks for every failover step. Time each DR test and track improvement. Involve all stakeholders (not just infrastructure team). Test both failover AND failback procedures. After each test, conduct a retrospective and update runbooks. Budget 4–8 staff-hours per quarterly test.
From cheapest to most expensive: (1) Backup-and-restore: restore from backups, hours to recover, lowest cost. (2) Pilot light: core components running, 10–30 min to scale up, low cost. (3) Warm standby: scaled-down replicas, minutes to scale, moderate cost. (4) Active-active: full redundancy, near-zero downtime, highest cost.
Typically 10–20% of production costs. You keep only essential services running (database replicas, DNS, minimal compute) and scale up during failover. For a $10,000/month production environment, pilot light DR costs $1,000–2,000/month.
Industry best practice is quarterly full failover tests and monthly component tests (database failover, DNS switching). Budget $1,000–5,000 per test for temporary resources and staff time. Untested DR plans fail 50%+ of the time during actual disasters.
Backup protects data (files, databases). DR protects the entire application stack (compute, networking, load balancers, DNS). You need both: backups ensure data recovery, DR ensures your application can run while primary infrastructure is unavailable.
For protection against regional failures (natural disasters, regional outages), yes. Cross-region DR protects against the widest range of failure scenarios. Same-region multi-AZ provides good availability but does not protect against region-level events.
AWS DRS (formerly CloudEndure) continuously replicates servers to a staging area in the DR region at $0.028/hr per server. During failover, it launches full-sized instances from the replicated data. It is simpler and often cheaper than manually building a DR environment.