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NTBackup Failures

For two weeks or better I have been receiving errors when using NTBackup.  The problem progressed from "An inconsistency was encountered." where one of four backups would fail to the current error "A fixed drive is not a valid drive.".  I am backing up three drives on the server to a dedicated storage machine.  My settings were configured via the backup wizard.

The most suggested remedies that I've found are consistent with this knowledgebase article, http://download.microsoft.com/download/5/6/1/561c9fd7-0e27-4525-94ec-4d2d38f61aa3/TSHT_SBS.htm#BKMK_backup , however, both remedies seem irrelevant to my situation -- I have over 3TB of storage space available and I am not backing up files in the same place I'm writing the files.

Any help would be appreciated.

Here is my backup log:

6/9/2008 8:30 PM
-------------------------------
Date: 6/9/2008
Time: 8:30 PM
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 6/9/2008 at 8:30 PM" /v:yes /r:no /rs:no /hc:off /m normal /j "Small Business Server Backup Job" /l:s /f "\\Dracula\E\STBackup\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 6/9/2008 at 8:30 PM"

Volume shadow copy creation: Attempt 1.
Backup (via shadow copy) of "C: "
Backup set #1 on media #1
Backup description: "SBS Backup created on 6/9/2008 at 8:30 PM"
Media name: "Small Business Server Backup (01).bkf created 6/9/2008 at 8:30 PM"

Backup Type: Normal

Backup started on 6/9/2008 at 8:37 PM.
Backup completed on 6/9/2008 at 9:26 PM.
Directories: 5516
Files: 48517
Bytes: 9,153,260,858
Time:  49 minutes and  9 seconds
Backup (via shadow copy) of "D: New Volume"
Backup set #2 on media #1
Backup description: "SBS Backup created on 6/9/2008 at 8:30 PM"
Media name: "Small Business Server Backup (01).bkf created 6/9/2008 at 8:30 PM"

Backup Type: Normal

Backup started on 6/9/2008 at 9:26 PM.
Backup completed on 6/9/2008 at 9:36 PM.
Directories: 3974
Files: 22224
Bytes: 3,662,451,471
Time:  9 minutes and  40 seconds
Backup (via shadow copy) of "F: Volume"
Backup set #3 on media #1
Backup description: "SBS Backup created on 6/9/2008 at 8:30 PM"
Media name: "Small Business Server Backup (01).bkf created 6/9/2008 at 8:30 PM"

Backup Type: Normal

Backup started on 6/9/2008 at 9:36 PM.

Error: The device reported an error on a request to write data to media.
Error reported: Invalid command.
There may be a hardware or media problem.
Please check the system event log for relevant failures.
The operation was ended.
Backup completed on 6/10/2008 at 3:07 AM.
Directories: 13853
Files: 271026
Bytes: 116,536,035,217
Time:  5 hours,  30 minutes, and  41 seconds

Error: F: is not a valid drive, or you do not have access.

The operation was ended.
Backup completed on 6/10/2008 at 3:08 AM.
Directories: 13853
Files: 271026
Bytes: 116,536,035,217
Time:  5 hours,  32 minutes, and  17 seconds

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

The operation did not successfully complete.

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

=======================<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 Tuesday, June 10, 2008 3:08 AM
Backup Runner finished.


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kscrib
Asked:
kscrib
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1 Solution
 
SysExpertCommented:
Did you check all the event logs to see any warnings or Errors ?

Has anything changed during this time period ( MS updates, firmware changes, network stuff  ? )

   
I hope this helps !
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kscribAuthor Commented:
I get errors with event ID's 8001 and 8019.  And there have been several changes recently.  The backup machine has been replaced, this coincides with the appearance of an occasional failure relating to validation of data.  Shortly afterwards, the backups began to fail consistently with the error shown above.

How do I determine which user account the backup is running under?  There have been some user/permissions changes recently.  I suspect that this user doesn't have permissions on the F: drive and I believe that this is the likely cause of this new error.
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kscribAuthor Commented:
I've discovered the user account being used and found that it was disabled.  I expect that this will fix the permissions part of my problem.
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SysExpertCommented:
Glad I could help, but why only a B grade ?


Grades
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