imapsync - Console-based utility for migrating IMAP mailboxes.
Zerto - Virtual replication & recovery solution
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.
audriga Email and Groupware migration - Easily migrate your email, contacts, calendar items and tasks to your new provider or server. No software installation is required.
Arcserve UDP - Arcserve UDP is data backup & recovery software that deals with unified data protection solutions, making you protect your computer system by creating data stores on the recovery point server.