Windows
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Open OneDrive settings (select the OneDrive cloud icon in your notification area, and then select the OneDrive Help and Settings icon then Settings.)
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Go to the Sync and back up tab.
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Select Manage Back up.
Make sure the folders you want to back up are selected and select Start backup. (You may close the dialog box while your files sync to OneDrive.)
Mac
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Click the OneDrive cloud icon up in your Menu bar, click the three dots to open the menu, and select Preferences.
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Go to the Backup tab.
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Select Manage Back up.