Database Mirroring
In SQL Server 2005, Microsoft introduced database mirroring, a method of increasing your database availability. With database mirroring, two copies of a database reside on computers in different locations, with one database in the active role and the other acting in the mirror role. Database mirroring is permitted on only databases using the full recovery model and is not permitted on the master, msdb or model databases.
Databases acting in the role of mirror are not eligible for backup. Therefore, Arcserve Backup does not show them unless they become "active". However, if you select the entire SQL Server for backup, mirrored databases in the active role are included by default, even if they served as the "mirror" when the job was created.
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