Disaster Recovery Cost Calculator

About the Disaster Recovery Cost Calculator

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.

When This Page Helps

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.

How to Use the Inputs

1. Enter the monthly cost of DR compute resources (standby/scaled-down instances).
2. Set the monthly cost of data replication (cross-region storage, database replicas).
3. Enter the monthly network cost for DR connectivity (VPN, Direct Connect to DR site).
4. Set the monthly cost of DR testing (regular failover drills, staff time, temporary resources).
5. Review the total DR monthly cost and its percentage of production cost.

Example Calculation

Tips & Best Practices

• Pilot light is the best balance of cost and recovery speed for most organizations.
• Use AWS CloudFormation or Terraform to quickly provision DR resources during an actual disaster.
• Automate DR failover with Route 53 health checks and failover routing policies.
• Cross-region RDS read replicas can be promoted to primary in minutes during failover.
• Test DR quarterly at minimum; surprised teams during actual disasters make expensive mistakes.
• Consider Elastic Disaster Recovery (DRS) for automated, low-cost server replication.

DR Strategy Cost Comparison

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 Elastic Disaster Recovery

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.

DR Testing Best Practices

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.

Frequently Asked Questions

• What are the DR strategy options?

  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.

• How much does pilot light DR 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.

• How often should I test DR?

  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.

• What is the difference between DR and backup?

  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.

• Should DR be in a different region?

  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.

• What is AWS Elastic Disaster Recovery?

  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.