troubleshooting Question

SBS 2003 Backup Error

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nikaotech asked on
SBSStorage Software
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I have a SBS 2003 with about 40 users.  The built-in ntbackup.exe routine runs daily at 10pm.  Recently, it began failing when trying to back up a specific partition.  It backs up the first 3 partitions, "C (system)", "D (databases)", "E (exchange)" successfully.  When it reaches the "F (user files)" partition it fails.  The F drive is where all of the redirected My Documents folders and other user files are located.  All 4 of those partitions are part of the RAID.  They get backed up to an internal non-RAID member drive.  There is plenty of space and the rest of the backup finishes correctly and can be read and restored from.  Additionally, if I manually run the ntbackup on the F drive it succeeds every time.

The error message in the backup log (I pasted only the relevant section) states:

Backup Type: Normal

Backup started on 2/15/2012 at 11:32 AM.
Backup completed on 2/15/2012 at 11:36 AM.
Directories: 271
Files: 4013
Bytes: 1,806,911,744
Time:  3 minutes and  47 seconds
Backup (via shadow copy) of "F: File Server"
Backup set #4 on media #1
Backup description: "SBS Backup created on 2/15/2012 at 10:30 AM"
Media name: "Small Business Server Backup (04).bkf created 2/15/2012 at 10:30 AM"

Backup Type: Normal

Backup started on 2/15/2012 at 11:37 AM.

Error: The device reported an error on a request to write data to media.
Error reported: Unknown error.
There may be a hardware or media problem.
Please check the system event log for relevant failures.
The operation was ended.
Backup completed on 2/15/2012 at 12:13 PM.
Directories: 2800
Files: 17626
Bytes: 16,339,035,497
Time:  36 minutes and  9 seconds

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


The operation did not successfully complete.


It seems the ntbackup.exe utility is being run by a system account that doesn't have full access to the entire F drive but I have no idea how to verify what account is being used or whether it has permissions to all of the user data.  

Any ideas?  Thanks in advance!
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