When you enable multiple data streams, backups are divided into multiple jobs. Each job backs up only a part of the backup selections list. To use multiple data streams, enable Allow multiple data streams on the Attributes tab for the policy.

You can choose to have NetBackup automatically determine where to begin new streams by adding an asterisk (*) after the directive. Or you can control where each stream begins by inserting the NEW_STREAM directive at a certain point or points in the backup selections list. If you use wildcard characters to define Exchange objects in the backup selections list, those objects are backed up in multiple streams.

When you back up multiple Exchange 2010 databases, NetBackup groups the backup jobs by the selected server. One snapshot is performed for all of the replicated databases on a given server. Another snapshot is performed for all the active databases on the server. Multistreaming then applies to the database backups that are performed on each snapshot.

For more information on the multiple data streams feature, see the following:

NetBackup Administrator's Guide, Volume I