An EBS volume's data must survive an AZ outage and be recoverable into a different AZ within minutes. What mechanism enables this?
A.EBS volumes automatically replicate across AZs
EBS replicates within an AZ only — a single volume does not span AZs.
B.EBS snapshots stored in S3, restored into a new volume in any AZ
Correct. Snapshots → S3 → restore to any AZ.
C.Attach the same volume to a second instance simultaneously
Multi-attach works only within a single AZ for specific volume types.
D.Instance store backup scripts
Instance store is ephemeral and unrelated to EBS volume recovery.
Why this answer
EBS volumes live in a single AZ, but snapshots are stored redundantly in S3 (multi-AZ). A snapshot can be restored as a new volume in any AZ — the standard recovery path when an AZ fails.
Correct answer: B · Last reviewed 2026-10-25
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