One of the best solutions to backup the entire Gmail data is by opting for a secure and reliable Gmail Backup Tool. This Gmail data backup tool allows you to safely backup the Gmail items into multiple file formats such as PST, MBOX, PDF, CSV, EML, etc. Moreover, users can also migrate their Gmail emails to Office 365, Yahoo Mail, Thunderbird, Opera Mail, iCloud, and many other web-based or cloud-based email clients. Apart from this, it has an interactive wizard that facilitates some advanced functionalities for the users that help in optimizing the entire process. You can also try the free version of this Gmail Backup Software in case you are willing to analyze its functionalities.