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Difficulty: MediumBusiness Continuity and Disaster Recovery

An enterprise organization is updating its disaster recovery strategy for an internal human resources application. The Business Impact Analysis (BIA) specifies a Recovery Time Objective (RTO) of 6 hours and a Recovery Point Objective (RPO) of 24 hours. To meet budget constraints, management wants to avoid paying for continuously running duplicate hardware and real-time data replication, but requires pre-routed networking and pre-installed server hardware so that daily backups can be loaded quickly following a disaster. Which of the following recovery site strategies best fulfills these requirements?

  1. A
    Cold site
  2. Warm siteAnswer
  3. C
    Hot site
  4. D
    Active-Active site

Answer

A warm site provides the optimal balance of pre-installed hardware infrastructure and cost savings, allowing system restoration from 24-hour backups within the 6-hour RTO window.
The correct strategy is a warm site. A warm site includes physical space, power, cooling, network connectivity, and pre-installed server hardware. Because data is not synchronized continuously in real time, administrators must restore recent daily backups (matching the 24-hour RPO) onto the hardware during a failover event, which can comfortably be completed within the 6-hour RTO without the high ongoing cost of active hot site replication.

Step-by-Step Solution

1
Analyze the RTO and RPO requirements
RTO is 6 hours (restoration time window) and RPO is 24 hours (acceptable data loss window).
Understanding recovery metrics determines whether real-time synchronization or periodic backup restoration is needed.
2
Evaluate infrastructure and budget constraints
The solution must avoid running duplicate hardware continuously (ruling out hot and active-active sites) but must have pre-installed hardware to meet 6 hours (ruling out cold sites).
Cold sites take too long to equip (days/weeks), whereas hot/active-active sites are too expensive to run continuously.
3
Select the appropriate recovery site type
A warm site provides pre-configured hardware and network infrastructure ready to receive restored daily (24-hour) backups within the 6-hour target.
Warm sites balance hardware readiness with cost efficiency for moderate RTO/RPO targets.

Key Concept

Disaster recovery site types and RTO/RPO trade-offs
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Topics

Business Continuity and Disaster Recovery

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