Issue

Sharepoint sites are skipped on veeam office 365 backup with the following warning:

Cause

To back up Web Parts with the Modern App-Only Authentication method, Veeam Backup for Microsoft 365 requires setting the "Export Mode" property of the web part from "False" to "True" to make this Web Part exportable and available for backup. Sometimes changing the "Export Mode" property is prohibited by a SharePoint administrator, and thus Veeam Backup for Microsoft 365 cannot change it and back up the Web Part. When this occurs, the "Cannot change WebPart ExportMode to 'All'. WebPart will be skipped" warning is shown.

Resolution

To allow changing the "Export Mode", you need to enable the "Allow custom script" option on the affected SharePoint sites.

If you want to back up Personal Sites or OneDrives, follow the steps described in this article:

• Microsoft 365: Allow or prevent custom script - To allow custom script on OneDrive or user-created sites

For any other SharePoint sites, follow the steps described in this article:

• Microsoft 365: Allow or prevent custom script -To allow custom script on other SharePoint sites