I am working on an outlook add-in where it is required to save the data to outlook server which can be used further. I am using saveAsync method for persisting the data and use the same for the add-in. Now i am not sure if there is any expiry of the data stored on the server. I have checked the documentation also but nowhere anything is mentioned related to this.
No, there is no expiration on your data. If you want to expire it, you'd need to do that explicitly in your code.