# Estimate the number and the size of all mails on youremail@gmail.com
gyb --email youremail@gmail.com --action estimate

# backup from youremail@gmail.com to your local-folder 
gyb --email youremail@gmail.com --action backup --local-folder "~/MyLocalFolder/"

# backup from youremail@gmail.com only important or starred emails to the default local folder GYB-GMail-Backup-youremail@gmail.com
gyb --email youremail@gmail.com --search "is:important OR is:starred"

# restore from your local-folder to youremail@gmail.com
gyb --email youremail@gmail.com --action restore --local-folder "~/MyLocalFolder/"