Backup Exec 2010 and Exchange 2010 - Cannot extract mailbox messages from the Exchange backup

Hello all

I have been using Backup Exec to back up several servers for months with generally little problems but last night my backup returned the errors below, can anyone provide some insight into this please?

Thanks in advance

Final error: 0xe00002f7 - Cannot extract mailbox messages from the Exchange backup. Review the job log for more information.
Final error category: Resource Errors

AND

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.