Full back-up and restore of Active Directory

Dear All,
We are about to raise the domain functional level of our domain. We have two DCs, both Windows Server 2008 R2, but the domain is still Windows Server 2003. From what I understand raising it to Windows Server 2008 or Windows Server 2008 R2 should not be a
problem, but reversing that process to a level below Windows Server 2008 would impossible "unless you are prepared to restore the entire domain from backups." I have looked for instructions on how this restoring of the domain from backups would work
(just in case I break SaMBa compatibility), but I have only found resources on how to perform a full server restore (which is unnecessary as our servers would still be there), or how to perform an authoritative restore of deleted items (which is not enough
as I would not just want to recover some lost items, but put it back to functional level Windows Server 2003).
Does anyone know of instructions specific to the "I need to reverse a domain functional level raise" question?
I am running daily "wbadmin start systemstatebackup" backups; would that be enough for this kind of restore?
Thank you for your help.
Yours,
FD

We are about to raise the domain functional level of our domain. We have two DCs, both Windows Server 2008 R2,
but the domain is still Windows Server 2003. From what I understand raising it to Windows Server 2008 or Windows Server 2008 R2 should not be a problem, but reversing that process to a level below Windows Server 2008 would impossible "unless you are prepared
to restore the entire domain from backups."
A forest recovery is required.
Before raising the domain functional level, you should be sure that you will not join Domain Controllers with OS lower than Windows Server 2008 to your domain. If this is your case then there will be no need for recovery. Otherwise, you will need to study
why you need to run DCs with OS lower than Windows Server 2008 before considering raising your DFL.
Christoffer and Paul already shared good references but I would like to add also the following one: http://blogs.technet.com/b/justinturner/archive/2007/01/18/active-directory-forest-recovery.aspx
This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.
Get Active Directory User Last Logon
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Management of test accounts in an Active Directory production domain - Part I
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Management of test accounts in an Active Directory production domain - Part III
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