Thanks Danielle, since Leo is disabled, I guess it doesn't matter too much. So, it's not possible to automate the backup procedure on Leo? I could just do it manually as I have been, but it was nice to not have to worry about it.
I did have my cpanelusername listed as I showed above, in the job command run, but not in the file itself. I was confused as to exactly how to list the filenames in the script itself. So to run the script itself, I was using:
php -q home/cpanelusername/public_html/pphbb/backup/database_backup.php
Is this not correct? And what exactly do I list as the "filename" in the script itself?