Update 03-using-the-graphical-user-interface.md

docs/03-using-the-graphical-user-interface.md

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 ## Deleting a backup job configuration
 
 You can delete a backup job if you no longer need to backup the files included in that backup job, or if the source files no longer exist. To delete a backup job, click on the backup name and click _Delete ..._ under _Configuration_.