Scheduling Backup job

Hi,

I am trying to schedule backup job on my win2K server. I log on as a domain admin and create the job then schedule it to run at certain time. But when I log off, the job never runs at all. The message in the log file is
Skipped files in “NT\NTBackup\data\FileBack.bks” folder. Folder not found.

However if I stay log on or lock the workstation the job run fines.

Please help. Thanks

Regards,
Edmond