Mirrored backup is a feature available in SQL Server 2005 Enterprise Edition and Development Edition. Mirroring a media set increases backup reliability by adding redundancy of backup media which effectively reduces the impact of backup-device failing. While taking backup of database, same backup is taken on multiple media or locations.
One of the most important roles of a DBA is performing regular backups of SQL Server data. Creating backups of critical business data should be one of the foremost concerns of a database administrator (DBA) because backups provide a way to restore data that otherwise could be completely lost. Now let us discuss the types of backups available in SQL Server 2005.