1. ArcTitan email archiving provides businesses with instant data encryption. Compliant fast, powerful, affordable and Office365 enabled. ArcTitan saves, indexes emails and enables you to search all the internal and external emails.

    open-source $2.92 / Monthly (Per User)

  2. Barracuda Backup provides cloud-integrated complete data protection for physical, virtual, and SaaS environments.

  3. MailStore Home - A 100% free single-private-user desktop solution

  4. FuseMail provides a comprehensive suite of cloud based email solutions for your business from email security, spam and virus filtering, archiving, encryption and email hosting.