Manually add the user accounts that you want to back up to the user group.
If you have different backup requirements for some user accounts, you can create user-defined user groups for those user accounts. For more information, see Creating User Groups to Back Up Specific User Accounts.
Procedure
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From the Command Center navigation pane, go to Protect > Microsoft 365.
The Microsoft 365 Overview page appears.
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On the Apps tab, click the OneDrive for Business app.
The app page appears.
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On the User groups tab, right-click default, and then select Manage.
The default dialog box appears.
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On the Users tab, click Add user.
The Add new content dialog box appears.
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In the User account column, select the user accounts that you want to add.
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Click Add, and then click Save.