Review of Disaster Backup and Recovery Technology of Information System

Disaster backup and recovery is an important approach for system security and reliability,which can be used as an important support for information assurance in the development policy of China informationization.The measurements used for assessing the performance of disaster-tolerant systems are introduced firstly.The key technologies and realization methods of data-level disaster tolerance,system-level disaster tolerance,and application-level disaster tolerance are then summarized.Three future directions of disaster backup and recovery techniques are presented,which is the service-model shift from the data-storage-center to application-service-center,the architecture shift from a centralized structure to a shared mode based on the combination of distribution and virtualization,and the application mode shift from an isolate and specified system to a comprehensive service system,respectively.