Which disaster-recovery approach keeps only the minimal data-replication components running in the DR Region — the data layer always live but the application stack provisioned only when needed?
A.Backup and restore
Backup/restore keeps only backups — no live data replication.
B.Pilot light
Correct. Always-on data layer + provisioned-on-failover app tier = pilot light.
C.Warm standby
Warm standby runs a reduced-capacity functional stack, not just the data layer.
D.Multi-site active/active
Active/active runs full capacity in both Regions simultaneously.
Why this answer
Pilot light replicates the data layer continuously (databases, critical storage) while the application tier stays undeployed until failover. Warm standby goes further — it keeps a scaled-down but functional app stack running.
Correct answer: B · Last reviewed 2026-10-25
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