However, sometimes a transaction log backup is larger than a full backup.

不过，有时事务日志备份要比完全备份还大。

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Transaction log backup — Backs up all of the transactions performed against the database after the last successful full backup or transaction log backup is completed.

事务日志备份——备份所有执行的事务日志(在上次完全备份之后执行的)。

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Then if a system or media failure occurs, you can use the transaction log and a third-party backup utility to recover your database.

如果系统或媒体发生失败，您可以使用事务日志和第三方备份实用工具恢复数据库。

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