MailStore - MailStore Home - A 100% free single-private-user desktop solution
SolarWinds Backup - Modern server backup software
MozBackup - Backup tool for Firefox and Thunderbird
Backup Exec - Backup Exec provides simple, complete backup and recovery protection for your business, to cover all data wherever it resides. Try free for 60 days.
imapsync - Console-based utility for migrating IMAP mailboxes.
MSP360 - MSP360 (CloudBerry) Backup is a platform that comes with a managed backup service and delivers data protection to users.