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
Gmvault - Backup the emails in your Gmail account.
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MailStore - MailStore Home - A 100% free single-private-user desktop solution
CrashPlan - CrashPlan for Small Business backup software offers the best way to back up and store business & enterprise data securely - offsite, onsite & online in the Cloud.
Got Your Back - Got Your Back (GYB) is a command line tool that backs up and restores your Gmail account.
Backblaze - Backblaze's remote backup automatically backs up your data to our secure datacenter.