Acronis Cyber Protect Home Office - (Formerly Acronis True Image) Complete protection for your digital life
imapsync - Console-based utility for migrating IMAP mailboxes.
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.
Cryoserver - Cryoserver is an all-in-one email archiving solution that empowers you to preserve your email in a tamper-evident archive, making you transform your data into a useful archive for everyday use.