例句 /

Backup 00034 -- The job failed with the following error: Microsoft SQL Server supports only full backups of the master database. Differential and transaction log backups are not supported.

Backup 00034 -- The job failed with the following error: Microsoft SQL Server supports only full backups of the master database. Differential and transaction log backups are not supported.

请问数据库在什么条件下才可以做差分备份?为什么我做的时候老是提示:数据库不支持?