Adding a replacement Server 2008 R2 DC in a Server 2003 environment

Here is my setup, situation, and questions:

I have a domain and forest functional level of Server 2003.

I have 2 domain controllers (Server 2003 and Server 2008 R2)

The server 2003 DC is primary and holds all masters and is our domain naming FSMO holder.

The Server 2008 R2 system was added as a backup DC a few years ago.  When it was added, I ran forestprep, domainprep, and gpprep (on our Server 2003)...since it was the first 2008 R2 domain controller being installed into our 2003 environment.

The Server 2008 R2 DC has been placed with a vendor for hardware repairs.

In the meantime, I want to add a new Server 2008 R2 DC to act as a backup DC.

My question is:
  1)  Do I need to run these commands again when adding a new 2008 R2 BDC (since the other server is with my vendor and not currently connected to my network)?
  2)  Can I set this server up as a BDC during business hours, or should I wait until after hours?
  3)  Are there any other things I need to consider?

Let me know, if additional information is needed.  I've been coming to this site for a long for answers, but have not asked any questions directly.

I appreciate any advice/suggestions, you have.
lshriverAsked:
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Santosh GuptaCommented:
Hi,

1.      No, you dont need to run those command again.
2.      if your 2003 server is already running then you dont need to up old server.
3.      If you want to remove old 2008 r2 then  do proper demotion or perform metadata cleanup before adding new 2008  R2 server.
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lshriverAuthor Commented:
@sgupta1181, thank you for the quick response.

Can I add the new domain controller during business hours?  Or should I wait until after hours?

Thank you again.
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Santosh GuptaCommented:
you can do any time. no impact.
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Windows Server 2008

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