Scheduled Backup of Remote W2K Servers Fails

Hi,
I have a W2kserver that contains SQL Server DB's & a web server. This is
connected via a backbone to my backup server which is also w2kserver.

When I create a scheduled Job on the backup server to run a backup of the
webserver folders & the SQL DB's it fails & the backup log shows "Skipped
files in "Sets\MyServer_Backup.bks" folder.  Folder not found."

Here is the run command:
C:\WINNT\system32\ntbackup.exe backup "@C:\ntBackup
Sets\MyServer_Backup.bks" /n "Media created 27/11/2004 at 13:10" /d "Set
created 27/11/2004 at 13:10" /v:yes /r:yes /rs:no /hc:off /m normal /j
"MyServer - Backup to BackupServer" /l:s /f "F:\MyServer Backup\MyServer.bkf
"

Curiously this fails if I am logged in as as Administrator as well as
running it as Administrator when I am not logged in.
However, the job runs fine if I run it interactivley.

I'm confussed & any help would be welcome
Thanks in advance
Pete B.