SolarWinds Backup - Modern server backup software
MailStore - MailStore Home - A 100% free single-private-user desktop solution
Druva inSync - Your device may be lost, but your data isn’t with Druva inSync™ Integrated backup, eDiscovery and compliance monitoring.
Gmvault - Backup the emails in your Gmail account.
Datto Backupify - Protect your business with backup.
Mail Backup X - Your one stop mail backup and archiving tool for Mac.