Question 1

What is disaster recovery?

Accepted Answer

Disaster recovery definition: Purpose: Restore IT systems after disaster, minimize business disruption, recover critical operations, protect data and systems. Scope: IT systems recovery, data restoration, infrastructure rebuilding, technology-focused. Difference from business continuity: DR = IT recovery focus, BCP = overall business operations, DR is subset of BCP, DR focuses on technology. Components: Recovery plan - documented procedures, Backup systems - data protection, Alternate site - backup location, Communication plan - notification procedures, Recovery team - assigned responders, Testing program - regular validation. Disaster recovery = IT-focused recovery. Restore systems quickly. Protect data. Document procedures. Test regularly. Coordinate with broader BCP.

Question 2

What are RTO and RPO?

Accepted Answer

RTO and RPO explained: RTO (Recovery Time Objective): Maximum acceptable downtime, time to restore systems, measured in hours/days, defines urgency of recovery. RPO (Recovery Point Objective): Maximum acceptable data loss, data age at recovery, measured in hours/days of data, defines backup frequency. Examples: RTO 4 hours = must restore within 4 hours, RPO 24 hours = accept up to 24 hours of data loss. Relationship: RTO determines recovery speed needed, RPO determines backup frequency needed. Setting objectives: Analyze business impact, assess cost of downtime, consider technical capability, balance cost vs protection. Trade-offs: Lower RTO/RPO = higher cost, higher RTO/RPO = more risk, find acceptable balance. RTO/RPO = define recovery targets. RTO = downtime tolerance. RPO = data loss tolerance. Balance cost and protection. Update as business changes.

Question 3

How do I test disaster recovery?

Accepted Answer

DR testing types: Tabletop exercise: Discussion-based, review plan verbally, identify gaps, low cost, low risk, good for plan review. Walkthrough: Step-by-step plan review, identify missing steps, verify procedures, low cost, moderate detail. Component testing: Test specific DR elements, backup restore test, alternate site test, focused validation. Full simulation: Simulate actual disaster, activate full recovery, test all procedures, high cost, most thorough. Annual testing: Comprehensive test annually, regulatory requirement often, validates full plan. Frequency: Tabletop quarterly, component testing monthly/quarterly, full simulation annually. Documentation: Record test results, identify issues found, update plan based on findings, track improvement. Testing = validate plan works. Regular testing. Document results. Fix gaps. Update plan. Annual comprehensive test.

Question 4

What should a DR plan include?

Accepted Answer

DR plan elements: Scope: Systems covered, priorities defined, critical vs non-critical, recovery order. Team: Roles and responsibilities, contact information, decision authority, availability requirements. Procedures: Detection procedures - identify disaster, Response procedures - initial actions, Recovery procedures - restore systems, Resumption procedures - return to normal. Resources: Backup locations, alternate sites, equipment needs, vendor contacts. Communication: Stakeholder notification, team communication, status updates, external communication. Testing: Test schedule, test procedures, success criteria, documentation. Documentation: Plan location, version control, update schedule, access control. Plan = comprehensive documentation. Define scope and team. Step-by-step procedures. Resources available. Communication clear. Test schedule. Maintain current version.

Question 5

How do I choose a recovery strategy?

Accepted Answer

Recovery strategy options: Hot site: Fully operational backup site, immediate availability, highest cost, fastest recovery (minutes/hours). Warm site: Partially equipped backup, some systems ready, medium cost, moderate recovery (hours). Cold site: Space available, no equipment installed, lowest cost, slower recovery (days). Cloud recovery: Cloud-based backup systems, scalable, moderate cost, flexible recovery. Mobile recovery: Portable recovery units, temporary facilities, specific scenarios. Factors: RTO requirements - faster recovery = higher cost, Budget constraints - balance protection vs cost, Data sensitivity - critical data needs better protection, Geographic risk - location-specific disasters. Selection: Match strategy to RTO/RPO, balance cost and protection, consider multiple sites, document strategy rationale. Strategy = match to needs and budget. Hot for fastest. Warm for moderate. Cold for low cost. Cloud for flexibility. Document choice rationale.

Disaster Recovery Guide

DR Components

Key Metrics

Recovery Phases

Testing Types

DR Checklist