DRS  Gmail Migration Tool  is the best Tool for Gmail Email backup. It can backup data such as Contact, Calendars , Drive and photos. It can converts data into multiple file formats such as PST, MSG, MBOX, HTML, PDF, CSV etc. It can migrates Gmail email data into Zoho mail, Yandex mail, Office 365, Hostgator, Hotmail etc. You can try free version. Technical support team available. Some of the other Solutions offer by the DRS are:

IMAP Migration Tool, Thunderbird Migration Tool, G Suite Migration Tool