Tutorials System Design Tutorial
Disaster Recovery Systems — Complete Guide
Disaster Recovery Systems — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of System Design Tutorial on Toolliyo Academy.
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System Design Tutorial · Lesson 87 of 100
Disaster Recovery Systems
Basics ✓ → Scale ✓ → Interview
Interview · 3 — Case studies · ~10 min · Module 9: Performance and Optimization
What is this?
DR systems restore service after major loss — backups, standby regions, runbooks, and declared RPO/RTO.
Why should you care?
ShopNest region failure or ransomware needs a practiced path back to revenue.
See it live — copy this example
Sketch the architecture on paper. These lessons focus on concepts and trade-offs.
RPO 5m / RTO 60m for Orders
Warm standby region + backup vault
Runbook: declare disaster → promote → DNS → verify payments
Game day every quarterRun Example »
This lesson uses terminal or setup steps. Run commands on your computer — the live editor appears on coding lessons.
What happened?
- Numbers drive design.
- Warm standbys cost money; cold restores cost time.
- Game days prove the paper plan.
Practice next
- Publish ShopNest RPO/RTO.
- Ensure offsite backups.
- Write promote+DNS steps.
- Automate health checks after promote.
- Keep read-only browsing mode as interim.
Remember
RPO/RTO first. Offsite + runbook. Game days.
ShopNest DR game day
Team promotes standby and processes a test order.
Outcome: Confidence + punch-list of real gaps.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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