MailStore - MailStore Home - A 100% free single-private-user desktop solution
Backblaze - Backblaze's remote backup automatically backs up your data to our secure datacenter.
MailSteward - MailSteward : The Ultimate E-mail Manager for Mac OS X
CrashPlan - CrashPlan for Small Business backup software offers the best way to back up and store business & enterprise data securely - offsite, onsite & online in the Cloud.
Gmvault - Backup the emails in your Gmail account.
ManageWP - ManageWP is a service for bloggers, site owners and web based companies helping them manage multiple WordPress sites from one dashboard.