Locally back up Gmail messages using Gmail's API over HTTPS. More information: https://github.com/GAM-team/got-your-back.
gyb --email email@gmail.com --action estimate
gyb --email email@gmail.com --action backup --local-folder path/to/directory
gyb --email email@gmail.com --search "is:important OR is:starred"
gyb --email email@gmail.com --action restore --local-folder path/to/directory