<p>There are many other third-party tools available in the web-market but only few of them are the reliable one. I want to suggest you to u MacSonik Gmail Backup tool for Mac that helps to backup of Gmail mailboxes into various file formats like PST, PDF, MBOX, EML, MSG, etc. on Mac. The software gives you an option to backup Gmail emails with or without attachments. It also maintains the folder hierarchy throughout the conversion process.</p>