mysqldump fails to dump database
If all you are getting is the header of the mysqldump, an error must be posted somewhere. In order to make the errors show up on demand, please run the dump like this:

mysqldump -u[username] -p[password] -h[hostname] zm3_quizzes 2&gt;zm3_quizzes.err | gzip &gt; [backup file path]


This should post the stderr of the mysqldump to zm3_quizzes.err.