Storage disaster recovery service SDRS is a service that provides disaster recovery for services such as elastic cloud server ECS, cloud hard disk service EVS, and dedicated distributed storage…

Question

Options

• AThe disaster recovery system not only protects the data, but also ensures the continuity of the
• BDisaster recovery is mainly for major natural disasters such as fire and land demand, so a certain
• CThe highest level of disaster recovery can achieve RPO=0, backup can set up to 24 automatic
• DIn the event of a failure (such as an earthquake, fire), the switching time of the disaster recovery

• A
  5% (3)
• B
  85% (53)
• C
  8% (5)
• D
  2% (1)

Explanation

Option B is the wrong description because disaster recovery is not limited to major natural disasters like fire or earthquakes. DR systems are designed to protect against a wide spectrum of failures, including hardware faults, software errors, network outages, and human mistakes, making the claim that it is "mainly for" catastrophic events factually incorrect.

Option A is a correct statement: unlike backup, which focuses on restoring data, DR ensures the entire service remains available, preserving business continuity. Option C is also correct: the highest tier of DR (such as active-active replication) can achieve RPO=0, meaning zero data loss, whereas backup solutions work on scheduled intervals and cannot match that. Option D is correct as well: DR systems can switch over to the standby environment in minutes or seconds, while recovering from a backup typically takes hours, making the recovery time comparison accurate.

Memory tip: Remember that backup is like a photograph (a snapshot in time, retrieved slowly), while disaster recovery is like a running spare engine (always ready, covers any breakdown, not just major crashes). If a statement tries to narrow DR to only "big disasters," it is wrong.

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