Windows SBS backup fails with 'The saved selection file "Script.bks" cannot be found.'

I have a Server running SBS 2003 and we are running SBS backup.

We have found that occasionally the back up will report as failed due to it being unable to access particular files as they are in use by another process, see sample log attached.

If we reboot the server to clear these, add the skipped files as exclusions so the selection is as follows:

C:\Documents and Settings\Administrator\Cookies\ /Exclude
C:\Documents and Settings\Administrator\Local Settings\History\History.IE5\ /Exclude
C:\Documents and Settings\Administrator\Local Settings\Temp\ /Exclude
C:\Documents and Settings\Administrator\Local Settings\Temporary Internet Files\ /Exclude
C:\Documents and Settings\All Users\Application Data\McAfee\ /Exclude
C:\Documents and Settings\All Users\Application Data\Microsoft\Windows NT\MSFax\ActivityLog\ /Exclude
C:\Documents and Settings\LocalService\Cookies\ /Exclude
C:\Documents and Settings\LocalService\Local Settings\History\History.IE5\ /Exclude
C:\Documents and Settings\LocalService\Local Settings\Temporary Internet Files\ /Exclude
C:\Documents and Settings\NetworkService\Cookies\ /Exclude
C:\Program Files\APC\PowerChute Business Edition\ /Exclude
C:\Program Files\McAfee\GroupShield for Exchange\ /Exclude
C:\Program Files\McAfee\Managed VirusScan\Agent\ /Exclude
C:\Program Files\Microsoft SQL Server\MSSQL$SBSMONITORING\Data\ /Exclude
C:\Program Files\Microsoft SQL Server\MSSQL$SHAREPOINT\Data\ /Exclude
C:\Program Files\Network Associates\MSSQL\Data\ /Exclude
C:\WINDOWS\Temp\ /Exclude
JET GS-SERVER\Microsoft Information Store\First Storage Group\

then the next back up will fail with 'The saved selection file "Script.bks" cannot be found.' although the script is still there.

I have tried some of the other recommendations within EE such as start>run>ntbackup load selection to get a corruption message, click ok and then resave the selection the backup will then skip the files again.

i feel as this is going around in a loop - one fix creates another problem and the fix for this creates the problem which the first fix was meant to sort. SBS-Backup-Log.txt
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ee_autoConnect With a Mentor Commented:
Question PAQ'd and stored in the solution database.
It seems that a scan is a virus scan is occurring at the same time.  Stop the service during backup if you can.  

2 scheduled tasks.

NET STOP "[McAfee service name]"

NET START "[McAfee service name]"
mtxitAuthor Commented:
Hi Andrew,

Thanks for the feedback - there is no scheduled virus scan which runs at the same time as the backup, however On Access Scanning is enabled.

If it is OAS doing this then surely this would occur on each backup? Disabling the OAS during the backup is not an option.

As a stop gap, I have switched to NT backup and will wait and see if the job fails again this weekend,
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