A popular way to do what you discuss is to change replication parameters during the upgrade.  Basically, have the ADC talk to an Active Directory isolated server, check for errors and then bring it back into the replication cycle. 
 
Another alternative I've seen work is to take a DC off-line during the upgrade.  I've seen some introduce a new one first and then bring it off-line during the upgrade.  After the all clear, it's then removed from the domain else brought back on-line. 
 
The first option is much better as it offers you a chance to check it out prior to moving forward.  The second option works if you can flatten all DC's but the one with the good data, in essence creating a hot backup.  I suppose you could just mark all the records authoritative and then reintroduce it, but....
 
I've never seen a successful ADC deployment that didn't spend a lot of time in the lab getting it right.
 
Al


From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Strand, Ted
Sent: Tuesday, August 03, 2004 3:34 PM
To: [EMAIL PROTECTED]
Subject: [ActiveDir] AD Backup - Sort of

I am about to turn on a connection agreement for my first AD connector.  I have backed up the exchange directory and also exported the directory to csv for recovery.  I would like to do the same thing with the AD data to have a roll-back plan if the CA does something I didn't expect.  I have played with LDIFDE and the CSV equivalent, and although I have been able to export with both, I have not been able to import back in to change the data.  Are there any other (preferably free) methods to capture this ad data, and then reuse it to undo changes?  I would hate to have to do an authoritative restore from tape to fix any issues.
 
Thanks
 
-Ted Strand-
 

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