To back up all your Gmail emails from your Gmail account onto PCs and hard drives, Use the Sysinfo Gmail Backup Tool. The tool provides 100% accurate results on backup. The tool allows to Backup of Gmail items into PDF, MBOX, PST, MSG, EML, & DOC formats. Some of the other features of the tool are:
Directly Imports all Gmail emails to Hotmail, Office 365, Yahoo, Yandex Mail, AOL, iCloud, and other email clients.
The software keeps the data structure and folder hierarchy intact during the conversion.
It also allows users to download Google Drive data to a local device.