BackupExec 2010 R3 Backup Issue

Hi Support,

I'm getting this strange error that re-ocours when running the daily backups, I'm using BackupExec 2010 R3 on Server 2008 R2.

Job ended: 29 July 2014 at 03:24:00
Completed status: Failed
Final error: 0xe00002f7 - Cannot extract mailbox messages from the Exchange backup. Review the job log for more information.
Final error category: Resource Errors

For additional information regarding this error refer to link V-79-57344-759

Backup- \\EXCHANGE10\Microsoft Information Store\earthlondon
V-79-57344-759 - Unable to complete the operation for the selected resource using the specified options for the following reason: VFF Open Failure.  This can be caused by low memory or disk resources.
 

Any suggestions on troubleshooting?

Thanks alot