SBS Backup Problem

Hi,
I know you have tons of mail but could i ask again about my backup
woes. i back up a standard sbs box to a NAS harddisk in another
building. i use std sbs backup rutine. i show the wizard the network
drive and complete the wizard.

all then works fine for usually a week or so then i get a failure and i
receive my failed email. it always fails within the first few mins. the
logs as you know dont really help but here it is:-


15/05/2006 20:00
-------------------------------
Date: 15/05/2006
Time: 20:00
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 15/05/2006 at 20:00" /v:yes /r:no /rs:no
/hc:off /m normal /j "Small Business Server Backup Job" /l:s /f
"\\Netcenter\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\backup09.log
=====================<BEGIN NTBACKUP LOG FILE>=====================
Backup Status
Operation: Backup
Active backup destination: File
Media name: "Small Business Server Backup (01).bkf created 15/05/2006
at 20:00"


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 15/05/2006 at 20:07.
Directories: 0
Files: 0
Bytes: 0
Time: 1 second

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

The operation was ended.
Backup completed on 15/05/2006 at 20:07.
Directories: 0
Files: 0
Bytes: 0
Time: 1 second

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

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 15 May 2006 20:07
Backup Runner finished.


i then log on remotely to my server. rename one of the latest backups
as a safegard and run the back up again by using the backup now button.
it usually works ok then, but sometimes on the second try. (you see why
i do the rename as it always deletes the bks file its going to replace)

my theory is.... at 20.00 it finds drive, deletes old backup then
starts estimate. this takes about 7 mins. it then cannot find the drve
again or times out when it looks for it to start the backup.
fix...somthing to hold onto drive to keep live. or a much stronger
search for drive when backup starts sending files after estimate stage.

any ideas? many thanks, martin

.

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