You will need to delete older files in the Completed Queue list. If you have the latest version installed the files will delete after 24-25 hours. If you do not have the latest version installed you should have this installed because there was a bug in the previous version that prevented files from automatically deleting. If files are deleting properly after 24 hours and you still have this I would suggest adding physical disk space. We are running with 250 gig. This is larger than what was recommneded but even with the files deleting automatically we needed more space because of the volume of files we are running.