文件系统通常为递增备份，这是为了最小化备份窗口和优化存储空间。
Filesystems are generally backed up incrementally to minimize the backup window and to optimize storage space.
存储对服务器显示为是本地的，其中端点存储设备可以为客户端设备实现附加服务(例如备份和复制)。
The storage appears local to the servers, where the endpoint storage device may implement additional services for the client devices (such as backup and replication).
这不但使对分布式站点数据更新变得更为容易，而且当服务器变得不可用时为数据存储提供了备份。
This not only makes it far easier to keep distributed sites up-to-date, but provides a backup repository in the event a server becomes unavailable.
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