Acronis Cyber Protect Home Office - (Formerly Acronis True Image) Complete protection for your digital life
MailStore - MailStore Home - A 100% free single-private-user desktop solution
Duplicati - Free backup software to store backups online with strong encryption. Works with FTP, SSH, WebDAV, OneDrive, Amazon S3, Google Drive and many others.
Gmvault - Backup the emails in your Gmail account.
rsync - rsync is a file transfer program for Unix systems. rsync uses the "rsync algorithm" which provides a very fast method for bringing remote files into sync.
Mail Backup X - Your one stop mail backup and archiving tool for Mac.