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The following figure shows a simple subclient configuration for an Exchange Mailbox iDataAgent.
Subclient2 comprises a user-defined set of mailboxes (those belonging to a specific department, for example). The default subclient consists of all other mailboxes in the information stores. Each subclient, when it is backed up or restored, establishes a logical data channel through which data can travel to or from the backup media.
In this configuration, you can schedule the backups of the default subclient and subclient2 either at different times or simultaneously. Splitting the backups into two time periods can be useful if you have smaller backup windows at various times.