You may receive a "disk space over quota" or "Disk space approaching Maximum Quota". There is one file which is the culprit. Go to http://YourDomainName.ext/cPanel>File Manager. Located in your public_ html folder is "error_log". The file can become unreasonably large. You need to permanently delete this file, skip the trash and create a new file with the same name. These can eliminate up to 100 mb + of disk usage.