Backup of Exchange Server takes too long

We are running Symantec Backup Exec 10d on two servers in SiteA and SiteB  but have a problem with the time taken to backup Exchange Server on the server in SiteB.

A full system backup on Server in SiteB has a total 66GB of which 29GB is Exchange Server and 37GB is system files and other data. The 37GB backs up in just over 2 hours but the 29GB of Exchange Server takes a further 17 hours. The backup in SiteA uses the same tape drive and same software and backs up a total of 71GB in just over 5 hours, although only 8GB of this Exchange Server data.
 
Does anybody have any idea what might be causing this problem?
infologicitAsked:
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Mehmet MuhannaSenior System EngineerCommented:
You may need to Defrag the Database, check the Disk that the Database is on, it may be too slow for making the process fast
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greesh_hemCommented:
Are they remote filesystems?
Exchange brick-level backups are painfully slow on 10d

If it is the backup device generally slow, try new BExec drivers, and try experimenting with different block sizes on the device settings.
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infologicitAuthor Commented:
It would appear that the backup job included the public folders which are located on another server in another office. By excluding the public folders from the backup the job completed in good time.
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