Add the users that you want to back up to the OneDrive for Business app. All users that you add are included in backups of the app.
From the navigation pane, go to Protect > Office 365.
The Office 365 apps page appears.
Click the app to add the user to.
The app page appears.
On the Users tab, click Add, and then select Users.
The Add user dialog box appears.
From the Office 365 plan list, select the plan to use for the user.
From the Users list, select one or more users to add.
What to Do Next
To update the number of the OneDrive for Business users, in the Add user dialog box, click Showing users from cache last updated on, and then click Refresh cache.