Gmail Backup Tool is the most effective and trusted solution that backup Gmail to a hard drive in different file formats such as PDF, PST, CSV, MBOX, HTML, EML, MSG, etc. Moreover, it also offers to migrate Gmail items to Office 365, Yahoo Mail, Hotmail, Thunderbird, iCloud, etc. Moreover, the tool is also competent enough to backup Gmail emails to the computer with an entire mailbox of items such as emails, contacts, calendars, etc. Additionally, it supports all versions of the Windows operating system. You can try the trial version of the softwrae to analyze the performance.