When designing a disaster recovery (DR) system, DR levels must be classified according to service-continuity requirements and cost investment.
Which of the following statements about DR levels are correct?
Data-level DR primarily provides remote storage and backup of service data; it does not by itself keep services running through a disaster. Application-level DR deploys corresponding application systems at the DR site, while service-level DR provides end-to-end redundancy for service continuity, including the supporting links and non-IT resources required to deliver the service. Huawei documentation describes data-level DR as a DR center that provides only the storage system, and application-level DR as including a DR center, data center, and service backup.
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