Schema master is a FSMO role, that is backed up with backup of computer that
is holding this role, but you must understand that all FSMO roles can be
recovered using seize procedure if the server holding this role fails and
can not be brought back online.
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Regards
Matjaz Ladava, MCSA, MCSE, MCT, MVP
Microsoft MVP Windows Server - Active Directory
(e-mail address removed), (e-mail address removed)