Try SysTools Gmail Backup tool to export Gmail emails, contacts, calendars and Google drive storage files into multiple file formats. This tool also takes the backup of Google Docs / Spreadsheets / Slides / Images. For more info, visit its official website: https://www.systoolsgroup.com/gmail-backup.html
ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
Gmvault - Backup the emails in your Gmail account.
Air Explorer - Air Explorer is a software to manage all your multiple cloud drives (like Dropbox, Onedrive, Google Drive, Mega, Mediafire, Box, Hidrive, Yandex, Baidu,...) as well as WebDav and FTP connections.
MailStore - MailStore Home - A 100% free single-private-user desktop solution
FileCloud - FileCloud is an enterprise file share, sync and mobile access solution.
Got Your Back - Got Your Back (GYB) is a command line tool that backs up and restores your Gmail account.