Is File History set per machine or per user?

[AWS]

I upgraded a system from Microsoft Windows 7 Professional x64 to Microsoft Windows 8 Enterprise x64. The Windows 7 system was using Backup and Restore. The system has two users. User A used the Control Panel to disabled the Backup and Restore schedule and
to enable File History. The Control Panel for User B reports that File History is off.

Is it necessary to enable File History as each User individually?
How are common files from Public, which may appear in the Libraries of multiple Users or in none of the user Libraries handled?

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