What are some alternatives?
When comparing Datto Backupify and MailStore, you can also consider the following products
CrashPlan PRO - 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.
Piler - Piler is an open source email archiving solution with all the necessary features for your enterprise
Backblaze - Backblaze's remote backup automatically backs up your data to our secure datacenter.
Mail Backup X - Your one stop mail backup and archiving tool for Mac.