SBS2003 backup logs - backup indicated fail - but still completed in size!

Hi, EE:
One of SBS2003 Backup indicated fail by reading logs file then the log data also said backup completed?
This backup process has never been failed before for the past 3 years
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in the log file, there was this one file can't opened / backup by ntbackup process... "access denied"...

We've done:
Backup media / drive checked & proof healthy
Space available
Scanned antivirus
No other backup running while this scheduled / run

Need help ASAP!
please review & offer any comment / solution from any experts
thank you!
Sam
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Error:
Backup Type: Normal

Backup started on 7/21/2008 at 1:04 AM.
Warning: Unable to open "C:\WINDOWS\system32\nvrsma.dll" - skipped.
Reason: Access is denied.

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Complete log file:


7/21/2008 1:00 AM
-------------------------------
Date: 7/21/2008
Time: 1:00 AM
User: SYSTEM
-------------------------------

Backup Runner started.
Launching NTBackup: ntbackup.exe backup "@C:\Program Files\Microsoft Windows Small Business Server\Backup\Small Business Backup Script.bks" /d "SBS Backup created on 7/21/2008 at 1:00 AM" /v:yes /r:no /rs:no /hc:off /m normal /j "Small Business Server Backup Job" /l:s /f "S:\SBS Backup\Backup Files\Small Business Server Backup (01).bkf" /UM
NTBACKUP LOG FILE: C:\Documents and Settings\SBS Backup User\Local Settings\Application Data\Microsoft\Windows NT\NTBackup\data\backup08.log
=====================<BEGIN NTBACKUP LOG FILE>=====================
Backup Status
Operation: Backup
Active backup destination: File
Media name: "Small Business Server Backup (01).bkf created 7/21/2008 at 1:00 AM"

Volume shadow copy creation: Attempt 1.
Backup (via shadow copy) of "C: Server"
Backup set #1 on media #1
Backup description: "SBS Backup created on 7/21/2008 at 1:00 AM"
Media name: "Small Business Server Backup (01).bkf created 7/21/2008 at 1:00 AM"

Backup Type: Normal

Backup started on 7/21/2008 at 1:04 AM.
Warning: Unable to open "C:\WINDOWS\system32\nvrsma.dll" - skipped.
Reason: Access is denied.


Backup completed on 7/21/2008 at 2:10 AM.
Directories: 7404
Files: 102102
Bytes: 21,792,748,237
Time:  1 hour,  6 minutes, and  52 seconds
Backup of "SERVER01\Microsoft Information Store\First Storage Group"
Backup set #2 on media #1
Backup description: "SBS Backup created on 7/21/2008 at 1:00 AM"
Media name: "Small Business Server Backup (01).bkf created 7/21/2008 at 1:00 AM"

Backup Type: Normal

Backup started on 7/21/2008 at 2:10 AM.
Backup completed on 7/21/2008 at 2:12 AM.
Directories: 4
Files: 5
Bytes: 1,792,058,158
Time:  1 minute and  48 seconds
Backup (via shadow copy) of "System State"
Backup set #3 on media #1
Backup description: "SBS Backup created on 7/21/2008 at 1:00 AM"
Media name: "Small Business Server Backup (01).bkf created 7/21/2008 at 1:00 AM"

Backup Type: Copy

Backup started on 7/21/2008 at 2:12 AM.
Backup completed on 7/21/2008 at 2:15 AM.
Directories: 253
Files: 2911
Bytes: 634,740,920
Time:  2 minutes and  55 seconds

----------------------

Verify Status
Operation: Verify After Backup
Active backup destination: File
Active backup destination: S:\SBS Backup\Backup Files\Small Business Server Backup (01).bkf

Verify of "C:"
Backup set #1 on media #1
Backup description: "SBS Backup created on 7/21/2008 at 1:00 AM"
Verify started on 7/21/2008 at 2:15 AM.
Verify completed on 7/21/2008 at 2:24 AM.
Directories: 7404
Files: 102102
Different: 0
Bytes: 21,792,748,237
Time:  9 minutes and  0 seconds

Verify of "SERVER01\Microsoft Information Store\First Storage Group"
Backup set #2 on media #1
Backup description: "SBS Backup created on 7/21/2008 at 1:00 AM"
Verify started on 7/21/2008 at 2:24 AM.
Verify completed on 7/21/2008 at 2:25 AM.
Directories: 4
Files: 0
Different: 0
Bytes: 1,792,058,158
Time:  50 seconds

Verify of "System State"
Backup set #3 on media #1
Backup description: "SBS Backup created on 7/21/2008 at 1:00 AM"
Verify started on 7/21/2008 at 2:25 AM.
Verify completed on 7/21/2008 at 2:25 AM.
Directories: 253
Files: 2911
Different: 0
Bytes: 634,740,920
Time:  17 seconds

----------------------

=======================<END NTBACKUP LOG FILE>=====================
NTBackup finished the backup with errors.

For more information about failed backups, see the article on troubleshooting your backup at the following Web page: http://go.microsoft.com/fwlink/?LinkId=18414

Backup ended at Monday, July 21, 2008 2:25 AM
Backup Runner finished.

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