Applies to: Exchange 2010 or later
By default, databases are backed up one at a time. You can back up each database concurrently (in parallel) using multistreamed backups.
Procedure
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From the CommCell Browser, expand Client Computers > client > Exchange Database.
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Right-click the appropriate subclient, and then click Properties.
The Subclient Properties dialog box appears.
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Click the Advanced Options tab.
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In the Backup Options area, in the Maximum Streams that can be used box, enter a value higher than 1.
If the value is equal to 1, the databases are backed up one at a time.
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Click OK.