Gmvault - Backup the emails in your Gmail account.
OwnBackup - OwnBackup provides automated backups of SaaS and PaaS data and restore tools for disaster recovery.
Datto Backupify - Protect your business with backup.
SolarWinds Backup - Modern server backup software
MailStore - MailStore Home - A 100% free single-private-user desktop solution
Spanning Backup for Salesforce - Spanning Backup for Salesforce is the backup and restore solution delivered directly within the Salesforce interface.