On Windows systems, you can browse for Exchange objects and add them to the backup selections list. Alternatively, you can specify the objects manually..
To add an Exchange object to the backup selections list by browsing
Navigate to and click the Exchange object to back up and click OK.
If a mailbox specification without wildcards does not end with a backslash, add it.
Add wildcard characters if you want to define groups of objects or use multiple data streams.
More Information
Adding Exchange entries to the backup selections list manually