Add the sites that you want to back up to the SharePoint Online app.
Note
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To add Project Web App sites, disable Modern Authentication. You can back up Project Web App sites only in a basic authentication environment.
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If your Microsoft 365 client uses the Multi-Geo feature and each region has a different tenant admin URL for SharePoint Online sites, you must configure a separate Microsoft 365 client for each region. Site discovery is specific to each tenant, so using separate clients ensures that SharePoint Online sites in all geo-locations are discovered.
 
Before You Begin
Procedure
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From the navigation pane, go to Protect > Office 365.
The Office 365 apps page appears.
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In the Name column, click the app.
The app page appears.
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On the Sites tab, click Add, and then select Add sites.
The Add sites dialog box appears.
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From the Office 365 plan list, select the plan to use for the sites.
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From the Sites list, select the sites to add.
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Click Add.