Overview
Any event that negatively impacts business continuity or finances is considered a disaster.
Disaster Recovery (DR) is about preparing for and recovering from such events.
Types of Disaster Recovery
- On-prem → On-prem: Traditional DR, often expensive and hardware-intensive.
- On-prem → AWS Cloud: Hybrid recovery model, leverages AWS scalability.
- AWS Region A → AWS Region B: Cloud-native DR using AWS infrastructure.
Key Concepts
- RPO (Recovery Point Objective) – Maximum acceptable data loss measured in time.
Answers: "Up to what point in time can data be recovered?"
- RTO (Recovery Time Objective) – Maximum acceptable downtime before systems must be restored.
Answers: "How quickly must the system be restored?"
Summary:
- RPO → Data loss tolerance.
- RTO → Downtime tolerance.