To prevent a single point of failure for offline archive logs such as media failure, log mirroring shouldl be used.

要防止脱机归档日志的单点故障，比如媒介失败，则应该使用日志镜像。

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Offline archive logs - archive logs that are being moved from active log directory to either another directory in another media or tape.

脱机归档日志——如果将联机归档日志从活动日志所在目录移动到其他目录或磁带中，就成为了脱机归档日志。

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Turning archive logging on requires an offline full database backup.

打开存档日志时需要执行一次离线全数据库备份。

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Now people can read or write an email, and archive or organize messages in Gmail while offline.

FORBES: Google Takes Gmail, Calendar, Docs Offline: A Big Plus For Chromebook