Backup fails for SharePoint sites deleted from Microsoft 365

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Problem description

SharePoint backup fails with the following message in the activity log:

[ERROR] SharePoint Backup failed for sitecollection: 5911869, reason: Requested site collection does not exist. (#10000010e)

The following error is displayed when a backup fails for SharePoint sites deleted from Microsoft 365:

[ERROR] SharePoint Backup failed for sitecollection: 5911869, reason: Requested site collection does not exist. (#10000010e)

To resolve this issue, disable backup from inSync for SharePoint sites that are deleted from Microsoft 365.

To disable backup for SharePoint sites from insync, perform the following steps:

On the inSync Management Console menu bar, click Data Sources > Microsoft 365. An overview page that provides a holistic view of all the configured Microsoft 365 app appears.
On the left-hand panel, click SharePoint. A page that lists all the discovered sites appears.
Select the site title that you want to disable. Click the icon and click Disable. A confirmation dialog box appears. Click Disable.