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Difference between backup domain controller and 2 gcs

Hi,

For the record is there a difference between installing a "backup domain controller" and just installing AD DS on a additional server?  Same difference right?

So for example if you have 5 dc that are all gc, you would have 4 backup dc and one main right?  thanks!
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Radhakrishnan
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Instead of add BDC you can add ADC (Additional Domain controller) since ADC has writable copy of AD database where as BDC only readable copy of AD database. If you configure as GC then it will be having list of AD objects on it's own domain and partial information of other domains. Please note that, do not configure GC and Infrastucture role on same server.
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Lee W, MVP
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"ADC" is not an official recognized term.  
the thing is once they're replicating they can be considered a backup ... if they are not then well .. its not a backup ...

when they say backup they jsut mean another server that has the roles on it. Some people chose to have multiple servers with diffrent roles some just choose to have one backup server with all the roles...
Proper use of terminology is important - failing to do so can result in erroneous advice - I've seen it happen SPECIFICALLY in relation to PDC/BDC and Active Directory.  If a person is asking this question, then CORRECT information should be presented, but "whatever" information that can be considered correct if you think of it like xyz.