Windows 2003 Backup job failing

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Windows 2003 Backup job failing


I'm using the backup tool in Windows 2003 to backup the system state of a server. Let's call it Server A. I've mapped a drive to another server, Server B, and the backup job saves the backup to a folder on Server B. When the job runs, as a scheduled task, it gives this error, Backup Status
The operation was not performed because the specified media cannot be found.

Yes, the drive was mapped to Server B. When I manually run the job, meaning I kick it off right away, it runs fine. No errors. But at night it always gives this error. I asked a coworker and they recommended creating a batch file that maps a drive to Server B. Then have a scheduled task that kicks off the 'mapdrive' batch file just before the backup job kicks off. That way the drive should be mapped. Ok. Did that. Same problem, same error. Yes, of course I tested both the map drive batch file and the backup job manually. I scheduled each as a task, 5 minutes a apart. They both ran perfectly. No problems. I asked me coworker about this again, they said create another batch file to delete the map drive after the backup job has run, just in case this is causing a problem. I did that. You guessed it. I got the same error message. Again, running all of these manually and as scheduled tasks during the day, works fine.

So, any ideas?