The Microsoft Exchange Attributes let you indicate what database backup source you want to use for an Exchange 2010 Database Availability Group or for an Exchange 2007 replication backup.
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Backup source for an Exchange 2010 DAG backup or an Exchange 2007 replication backup
Configuring a preferred server list for an Exchange 2010 Database Availability Group (DAG)
Backup status for Exchange Database Availability Groups (DAGs) and the preferred server list