How Does Backup as a Service Work?
In employing backup as a service, the first step is to purchase and sign up for the service. Next, you select the services you want to back up. To back up Microsoft Office 365, select Exchange Online or SharePoint Online, or OneDrive for Business.
You make those selections only once. After the initial setup, changes to data you've selected, as well as new data added to the services you've selected, are backed up automatically and, with most online backup services, almost instantly.