In differentiating between protection configurations, which option provides the highest level of data durability for ECS object storage?

Question

Options

• ASingle-copy storage in one Availability Zone
• BData replication across multiple Availability Zones within a region
• CEncryption at rest only, without additional replication
• DStoring backups on physical media offsite

• A
  8% (3)
• B
  87% (34)
• C
  3% (1)
• D
  3% (1)

Explanation

Data replication across multiple Availability Zones (AZs) provides the highest durability because it ensures that even if an entire AZ experiences a failure (power outage, hardware failure, disaster), your data remains accessible and intact in the surviving zones - this is the foundation of enterprise-grade object storage durability (e.g., 99.999999999% "11 nines").

• A is wrong because single-copy storage in one AZ creates a single point of failure - if that AZ goes down, your data is gone or inaccessible.
• C is wrong because encryption at rest protects confidentiality, not durability - it does nothing to prevent data loss from hardware failure or disasters.
• D is wrong because offsite physical backups address disaster recovery, not real-time durability; they introduce significant recovery time and don't protect against live data loss.

Memory tip: Think of durability as "how many copies, how far apart?" - the more geographically spread your replicas, the higher the durability. AZ replication = always-on redundancy, while backups = recovery-after-the-fact.

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