To create an update to an existing SharePoint Online backup project, please follow these steps.
1.Select your existing SharePoint Online backup project from the Backup Navigator, right click and choose Update or select the Update button located in the ribbon.
SharePoint Online Update Backup
2.On the Update Backup dialog, select from the available options for either a Full, Incremental or Differential update.
3.Click Finish to begin. If you have not already entered your credentials, you will be prompted to do so now. Make sure to provide a username and password that has at least Full Control to this site, Site Collection Administrator is preferred. Once the credentials have been verified, the update process will begin shortly.
4.When this update is complete, you will either receive a message in the user interface or if configured, an email will be sent to let you know the backup is complete. Your update will now appear in your Backup project as a new node that displays the time at which the update began as well as the type of update that was run.
5.Repeat this section if you wish to create additional backups of any type; full, incremental, differential. As more updates are completed, they will all appears in chronological order (oldest at the top) within the backup project.
SharePoint Online Backup Project with Updates