https://thenextweb.com/apps/2017/07/13/googles-free-desktop-backup-tool-is-now-available/
https://www.google.com/drive/download/
otherwise online - https://gmail.googleblog.com/2013/12/download-copy-of-your-gmail-and-google.html
open/browse mbox file with freeware https://sourceforge.net/projects/mbox-viewer/
origin - http://www.pipiscrew.com/2017/07/googles-free-desktop-backup-tool-gdrive-is-now-available/ googles-free-desktop-backup-tool-gdrive-is-now-available