Gmvault is described as 'Backup and restore your gmail account at will. Liberate your emails and never lose that part of your life. Backup all your emails on disk. Use the full sync mode to backup your entire gmail account in a unique directory' and is an app in the Backup & Sync category. There are more than 10 alternatives to Gmvault for a variety of platforms, including Windows, Linux, Mac, Online / Web-based and iPhone. The best alternative is MailStore. It's not free, so if you're looking for a free alternative, you could try Piler or Got Your Back. Other great apps like Gmvault are Backupify (Paid), Mail Backup X (Freemium), Horcrux (Paid) and Dropmyemail (Paid).
Systools Gmail backup is a tool to backup single or multiple Gmail accounts in one go. Software backed up emails into well accepted EML, PST, MBOX and MSG formats. Apart from emails tool saves contacts to vCard and calendars to ICS file formats.
Export your Office 365 mailboxes and Public folders. Archive mails offline. Don’t spend your dollars to retain unwanted mail content in cloud. Move your data to any external storage or have any third-party archival systems consume the exported data.
MailShelf Pro is a professional email archiving solution that covers all important aspects of a secure and compliant long-term archiving of your emails and which also offers you many additional features.