There are two functions provided for users - Smart Link Backup and Load Balance.

有两个功能，为用户提供智能链路备份和负载平衡。

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If data backup is required, connect the backup device to the storage server using an extra copper or fiber link.

如果需要数据备份，请用额外的铜缆或光纤链路把备份设备连接到存储服务器。

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Instead, create a hard link from the new backup to the same file in the existing backup.

相反，在新备份中创建一个指向现有备份中同一文件的硬链接。

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Not all planes across oceans have data-link capabilities, and high-frequency radio is still used with some flights and as a backup with others.

WSJ: How New Air-Traffic Control Systems Operate Over Oceans