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DR Architecture in Cloud Computing

Learn about DR Architecture in this comprehensive Cloud Computing tutorial. Testing is mandatory.

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1Untested DR is No DR

A Disaster Recovery plan is useless if you've never tested it. Companies regularly schedule 'Game Days' where they intentionally break their own infrastructure to ensure their failover strategies actually work in reality.

2Step-by-Step Breakdown

Disasters Happen. Datacenters flood, human error deletes databases, and natural disasters occur. Disaster Recovery (DR) is how you prepare for and recover from these events.

RPO (Recovery Point Objective). How much data loss is acceptable? If you back up daily, your RPO is 24 hours (you might lose a day of data).

RTO (Recovery Time Objective). How much downtime is acceptable? If it takes 4 hours to boot up new servers, your RTO is 4 hours.

Strategy 1: Backup and Restore. The cheapest, slowest method. You back up data to S3. If disaster strikes, you manually provision servers and restore data.

Knowledge Check. Which DR metric defines the maximum acceptable amount of data loss measured in time?

→RTO (Recovery Time Objective)
→RPO (Recovery Point Objective)

Strategy 2: Pilot Light. You keep core infrastructure (like databases) running continuously in a secondary region, but web servers are turned off until needed.

Strategy 3: Warm Standby. A scaled-down version of a fully functional environment is always running in the secondary region. You just scale it up when disaster hits.

Strategy 4: Multi-Site Active/Active. Full infrastructure runs simultaneously in multiple regions. Route 53 routes traffic to both. Zero downtime, but extremely expensive.

Cross-Region Replication. A key component of DR is getting your data to another region. Features like S3 Cross-Region Replication (CRR) and Aurora Global Databases make this easy.

Summary. Choose your DR strategy based on your business's RPO/RTO requirements and budget.

Pascual Vila

Frontend Instructor // Code Syllabus

Common Pitfalls & Errors

The Error //

Having backups but never actually testing a restore

aws backup start-restore-job --recovery-point-arn arn:aws:backup:... --metadata file://restore-metadata.json

The Solution //

A backup nobody has restored from is an assumption, not a disaster recovery plan — corrupted backups, missing permissions, or an incomplete restore procedure are only discovered when it's too late. Schedule regular restore drills into a sandbox environment to verify backups are actually usable.

The Error //

Choosing a DR strategy (Pilot Light, Warm Standby, Multi-Site) without matching it to actual RTO/RPO requirements

// Match strategy to requirements:
// RTO in hours, RPO in hours -> Backup & Restore
// RTO in minutes -> Warm Standby or Multi-Site Active/Active

The Solution //

Backup & Restore is cheap but can take hours to recover; Multi-Site Active/Active is fast but expensive to run continuously. Pick the strategy based on the business's actual tolerance for downtime (RTO) and data loss (RPO) rather than defaulting to whichever is cheapest or most familiar.