Getting rid of a Windows Backup Utility job

I am switching over to different backup software, and so am getting rid of my old backups created through the Windows Backup Utility on XP Pro x64. When we originally set up the backup, we scheduled it to run every Wednesday, which it’s done for the past couple years. However, now, I cannot for the life of me figure out how to “unschedule” that job, so it’s not creating new backups I don’t want and eating up the space on my backup drive. I’ve looked in Windows Scheduled Tasks and it’s not there. In the Utility itself, there doesn’t seem to be a way to edit the schedule without creating a new one – honestly I’m not sure if I’d end up making two different schedules, then.

If I just delete the backup file, will that do it? Is that where the schedule resides? Google hasn’t helped me – apparently not a lot of people wanting to turn their backups off (or Microsoft isn’t admitting it, anyway).