Grading protection is an important tenet in information security technology. This tenet is also applicable to the network disaster-tolerant system.

等级保护是信息安全技术的重要原则之一，作为信息安全重要组成部分的网络容灾系统同样要遵循这一原则。

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Furthermore, FSS can do load balancing between geographically distributed FSS system, which can save bandwidth, improve quality of network services and be disaster-tolerant.

而且，FSS具有全局负载平衡的能力，可节约网络带宽，改善网络服务质量，同时易于管理且具有良好的抗灾害性。

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Disaster tolerant system ensure the computer system to work normally when a disaster occurs.

容灾系统能够保证在灾难发生时，计算机系统仍然能正常工作。

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