SBS Backup failures

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Help please.

SBS backup works OK for one or two days and then fails (again once or
twice).

Backup device is internal SCSI HP 36/72 DAT

Backup log:--

12/20/2007 9:30 PM
-------------------------------
Date: 12/20/2007
Time: 9:30 PM
User: SYSTEM
-------------------------------

Backup Runner started.
NTMS session started successfully.
EnumerateNtmsObject(NTMS_LIBRARY) succeeded.
Will enumerate on 3 media libraries found.
GetNtmsObjectInformation(NtmsLibraryInfo) succeeded.
GetNtmsObjectInformation(NtmsLibraryInfo) succeeded.
Found an enabled library.
InventoryNtmsLibrary(NtmsInventoryOmid) succeeded.
Identify Media completed
EnumerateNtmsObject(NTMS_PHYSICAL_MEDIA) succeeded.
Will enumerate on 0 media types found.
GetNtmsObjectInformation(NtmsLibraryInfo) succeeded.
Found an enabled library.
InventoryNtmsLibrary(NtmsInventoryOmid) succeeded.
Identify Media completed
EnumerateNtmsObject(NTMS_PHYSICAL_MEDIA) succeeded.
Will enumerate on 1 media types found.
GetNtmsObjectInformation(NtmsPhysicalMediaInfo) succeeded.
GetNtmsObjectInformation(NtmsMediaTypeInfo) succeeded.
Found a tape media type in the library (4mm DDS).
Launching NTBackup: ntbackup.exe backup "@C:\Program Files\Microsoft Windows
Small Business Server\Backup\Small Business Backup Script.bks" /d "SBS
Backup created on 12/20/2007 at 9:30 PM" /v:yes /r:no /rs:no /hc:on /m
normal /j "Small Business Server Backup Job" /l:s /p "4mm DDS" /UM
NTBACKUP LOG FILE: C:\Documents and Settings\SBS Backup User\Local
Settings\Application Data\Microsoft\Windows NT\NTBackup\data\backup06.log
=====================<BEGIN NTBACKUP LOG FILE>=====================
Backup Status
Operation: Backup
Active backup destination: 4mm DDS
Media name: "Media created 12/20/2007 at 9:30 PM"

Volume shadow copy creation: Attempt 1.
Backup (via shadow copy) of "C: SYS"
Backup set #1 on media #1
Backup description: "SBS Backup created on 12/20/2007 at 9:30 PM"
Media name: "Media created 12/20/2007 at 9:30 PM"

Backup Type: Normal

Backup started on 12/20/2007 at 9:33 PM.
Backup completed on 12/21/2007 at 3:04 AM.
Directories: 3381
Files: 38391
Bytes: 17,368,534,090
Time: 5 hours, 31 minutes, and 26 seconds
Backup (via shadow copy) of "D: Data"
Backup set #2 on media #1
Backup description: "SBS Backup created on 12/20/2007 at 9:30 PM"
Media name: "Media created 12/20/2007 at 9:30 PM"

Backup Type: Normal

Backup started on 12/21/2007 at 3:04 AM.
Backup completed on 12/21/2007 at 4:24 AM.
Directories: 1409
Files: 21257
Bytes: 8,855,922,150
Time: 1 hour, 19 minutes, and 28 seconds
Backup of "SBS\Microsoft Information Store\First Storage Group"
Backup set #3 on media #1
Backup description: "SBS Backup created on 12/20/2007 at 9:30 PM"
Media name: "Media created 12/20/2007 at 9:30 PM"

Backup Type: Normal

Backup started on 12/21/2007 at 4:24 AM.
The requested media failed to mount. The operation was aborted.
The operation was ended.
Backup completed on 12/21/2007 at 7:55 AM.
Directories: 0
Files: 1
Bytes: 3,815,765,792
Time: 3 hours, 31 minutes, and 6 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 Friday, December 21, 2007 7:55 AM
Backup Runner finished.


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