Automatically Backup your Gmail account on a schedule with GMVault and Mac OS X launchd

While looking over my backup routines, I stumbled on Scott Hanselman’s post Automatically Backup your Gmail account on a schedule with GMVault and Windows Task Scheduler. I had never really thought about backing up my Gmail account, but why not. Even though I’m mainly a Windows guy, my Windows 8 machine at home is a big tower that requires quite a lot of electricity and is therefore only powered on when needed. My Mac Mini on the other hand is constantly on acting as a server, so why not run GMVault from there?