[snakes1100]

To use the cmd line, you need to shell into your server via ssh or in your case a terminal on your mac, just open a terminal window.

Select the Go option from the main menu bar and select the Utilities menu, then select the Terminal Application.

@ the prompt, type the following:
ssh username@iptoserverhere

As your on a whm/cpanel server, there is no need to manually dump the db, unless you want just the db & not your file structure.

WHM & Cpanel both have automated backup systems, WHM you can setup to run itself & backup nightly to a folder yo ucan DL from.

Cpanel, you have to click the backup link & generate the backup, then download it.