Why Backup Office365 & M365
With Microsoft Office 365, you can work from anywhere without the need to host your own email, files and SharePoint infrastructure. However Microsoft only protects Office 365 at the infrastructure level. It’s still your data. You control it. And it is your responsibility to protect it at a data-level.
Microsoft Service Level Agreement states “We strive to keep the Services up and running; however, all online services suffer occasional disruptions and outages, and Microsoft is not liable for any disruption or loss you may suffer as a result. In the event of an outage, you may not be able to retrieve Your Content or Data that you’ve stored. We recommend that you regularly backup Your Content and Data that you store on the Services or store using Third-Party Apps and Services.”