An excellent choice for backup Gmail database, is Mailvita Gmail Backup for Mac Tool. It lets you download Gmail emails and their attachments into formats like PST, MBOX, EML, MSG, and more, while keeping the folder organization and email properties the same. You can choose which folders or dates to back up with this tool, and the exported files will be easy to open in email apps like Outlook, Thunderbird, or Apple Mail. It works with all versions of macOS and has a free trial edition that lets you try it out before you buy it.
Click Here for details: https://www.youtube.com/watch?v=yaELgT-vv9A
Click Here for details: https://www.youtube.com/watch?v=yaELgT-vv9A