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Backup Strategies: A Deep Dive for System Design
Last Updated: January 5, 2026
Ashish Pratap Singh
8 min read
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Backup Strategies: A Deep Dive for System Design...
1. Why Backups Matter
1.1 Failure Modes
1.2 Replication Is Not Backup
1.3 The Cost of Data Loss
2. Recovery Objectives: RTO and RPO
2.1 Recovery Point Objective (RPO)
2.2 Recovery Time Objective (RTO)
2.3 The RTO-RPO Matrix
3. Backup Types: Full, Incremental, and Differenti...
3.1 Full Backup
3.2 Incremental Backup
3.3 Differential Backup
3.4 Comparison
3.5 Combined Strategy
4. The 3-2-1 Backup Rule
4.1 The Rule Explained
4.2 Implementation Example
4.3 Modern Extensions: 3-2-1-1-0
4.4 Cost Considerations
5. Backup Storage Strategies
5.1 On-Premises Storage
5.2 Cloud Storage
5.3 Hybrid Strategy
5.4 Immutable Backups
6. Database Backup Strategies
6.1 Logical vs Physical Backups
6.2 PostgreSQL Backup Strategies
6.3 MySQL Backup Strategies
6.4 MongoDB Backup Strategies
6.5 Backup Strategy Comparison
7. Backup Verification and Testing
7.1 Why Testing Matters
7.2 Testing Strategies
7.3 Automated Testing Schedule
7.4 Documentation Requirements
8. Disaster Recovery Planning
8.1 DR Tiers
8.2 DR Architecture Example
8.3 Failover Procedures
8.4 Failback Considerations
9. Common Interview Questions
9.1 Design Questions
9.2 Troubleshooting Questions
9.3 Quick Reference
Summary
References
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Course Introduction
