You can add individual SharePoint Online sites as backup content for SharePoint Online apps.
Procedure
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From the navigation pane, go to Protect > Office 365.
The Office 365 Overview page appears.
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On the Apps tab, click the app.
The Overview page of the app appears.
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On the Content tab, at the upper-right area of the page, click Add.
The Configure Content page appears.
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Select Add content to backup, and then click Next.
The Add Content tool appears.
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Under Standard, select Sites, and then click Next.
The Content tab appears.
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Select the sites that you want to add to the backup content, and then click Next.
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In the Office 365 plan list, select the plan you want to use to back up all sites, and then click Next.
The Summary tab appears.
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Click Submit.