You can back up a SharePoint Online site on demand.
Note
By default, only the latest versions of SharePoint files and list items are backed up. To back up all versions, go to the backup plan page. In the SharePoint pane, move the Back up all file versions toggle key to the right.
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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Select a site, and then click Back up.
A message prompts you to confirm submission of the backup job.
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Click Yes.