You simply can't rely on one method and one type of backup.

您只需不能依靠一种方法和一种类型的备份。

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If you are using circular logging, offline backup is the only type of backup supported.

如果您正在使用循环日志记录，脱机备份是惟一受支持的备份类型。

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In many cases, this type of backup will be adequate, and it provides a great deal of control for the administrator.

在许多情况下，这类备份将是足够的，并且为管理员提供了极大的控制能力。

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"In the near future, this type of simple laser communication might serve as a backup for the radio communication that satellites use, " Smith said in a statement.

CNN: STORY HIGHLIGHTS