The destruction of email via employee intent or ransomware can easily be mitigated via backups.
It is also important to know that Microsoft does not provide backups of data being stored within their Office 365 subscriptions.
Infosoda combats this inherit weakness by providing backups of email in all of our email security packages. Or premium email security packages enhances the amount of data being backed up per user by including backups of OneDrive files, SharePoint files, and Teams files/conversations.