With a strong takeup of Office365, even Microsoft will advise that clients should make another protection copy of their vital email data. Backup solutions designed to extract not just emails, but also SharePoint Online, OneDrive for Business and other cloud app (eg Salesforce.com) content and copy it in a manged way back to premise, or indeed another cloud, is key in today's world. Further, good backup solutions can enable cloud migration of VMs and content, but also facilitate disaster recovery to the cloud.