Basic Information
| Field | Details |
|---|---|
| English name | Disaster Recovery Strategies |
| Full name | Disaster Recovery Strategies |
| Chinese description | 灾难恢复策略 |
| Japanese description | 災害復旧戦略 |
| Exam frequency | ⭐⭐⭐⭐⭐ |
| Often confused with | Backup / Multi-AZ / AWS DRS |
In one sentence
Select backup and restore, pilot light, warm standby, or multi-site active/active according to RTO, RPO, cost, and complexity.
Key points
- Backup and restore is least costly but usually has the longest recovery time.
- Pilot light keeps critical data and core components running; warm standby keeps a reduced working environment.
- Multi-site active/active offers the fastest continuity but has the highest cost and operational complexity.
Exam takeaway
Replication is not enough: automate recovery, test failover and failback, and verify dependencies and data consistency.
Update: four DR strategies and recovery validation
- Backup and restore, pilot light, warm standby, and multi-site active/active progressively increase running resources, reduce recovery time, and raise cost and operational complexity.
- MGN supports planned server migration; DRS supports ongoing disaster recovery, drills, and failback; AWS Backup manages backup plans and recovery points.
- Replication is not backup, and configured plans are not proof of recoverability. Validate recovery points, permissions, KMS, restore procedures, and business function.