DO YOU DO A BACKUP OF YOUR MICROSOFT 365 DATA?
Although Microsoft offers a state-of-the-art platform to work with, it does not provide users with data backup. Users are required to independently take care of the protection and storage of their own files to insure them against permanent loss.
This information is stated in the "Microsoft Services Agreement". As stated in point 6:
a) Third Party Services, Applications and Services, or materials or products offered through the Services, may be unavailable from time to time, may be offered for a limited time, or may vary by region or device. If you change the location associated with your Microsoft account, you may need to re-acquire material or programs that were available and paid for in your previous region.
b) We strive for the Services to be up and running; all network services suffer from occasional disruptions and interruptions, and Microsoft is not responsible for any interruptions or losses that may occur. In the event of an interruption, you may not be able to retrieve your content or the data you have stored. We recommend that you regularly back up the content and data you store on the Services, using third-party applications and services.