You can try the MacSonik Gmail Backup Tool for Mac for backing up Gmail data. It is a direct and cost-effective solution that safely backs up Gmail emails to PST, EML, DOC, DOCX, EMLX, MBOX, TXT, MSG, CSV, JPG, PNG, GIF, etc. The application is user-friendly and possesses numerous features that help in obtaining the desired results in a minimum time. It can remove duplicate mail items based on To, From, Date, Subject, Bcc, Body, etc. However, it has a free demo as well which you can use to check the process for free. It allows you to back up the first 50 Emails Per Folder free of cost.