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Active Directory - Adding & Backing up Domain Controllers

Ive inherited a domain environment and i need a little bit of help, pointers, best practices, suggestions,etc...you get the point. First here is my environment, then i will ask the questions:

Two Domain Controllers DC1 & DC2, two locations Site A & Site B both on two diffrent subnets however they can communicate with each other. Both boxes are running Windows 2008 Server r2.

Site A DC1 Roles and services:

Schema Master
Domain Naming Master
RID
PDC
Infrastructure Master
Operations Masters

Active Directory Domain Services
DHCP
DNS
File Services
Print and Document Services
Multiple Group Policies

Site B DC2:
**Schema Roles/AD roles...How do i tell??

Active Directory Domain Services
DNS
File Services
Remote Desktop Services

So now on to my questions..

#1 - I know through arcserve we are backing up the system state on both of these servers just once a month? Is this acceptable? Should i be backing something else up? Should it be more frequent? Should i be backing it up from the server itself with the backup utility?

#2 I want to add another DC to site A. What version of 2008 r2 do i need? When i do dcpromo, do i just follow the prompts? I know that it will ask to install DNS, do i need this for this domain controller? What is the best way? My goal for this DC, is that in the event that DC1 goes down hard users at site A can get DHCP, DNS, File services,  and authenticate and minamize down time? My understanding the way we have it, if DC1 went down DC2 could authenticate and use DNS however dhcp would be broke.

Im very new to this company and dont want to break anything by implementing a new DC. Thanks in advance and i look forward to hearing all the answers.

Earlyriser
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Darius Ghassem
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I wholeheartedly agree with the previous comments - you can add any version as an additional DC without issues, just follow the prompts and select additional DC for existing domain. Make the new machine a DC, then add DNS.

Reconfigure the DCs to use each other as there preferred DNS server and themselves as alternate DNS. Reconfigure DHCP to give the addresses of both machines as DNS servers.
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I may still have a few other questions about backups. Being new to E-E, should this be in the form of a new question or can i add to this? Which is preferred?

Thanks.