Exchange 2010 DAG Backup

To backup Exchange 2010 DAG. DO you need to install the agent on both the servers or just on one.
How are the transaction logs handled on both the server with backup exec 2010 r2.
Any reomendations and best practices.
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Malli BoppeAsked:
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JhonnylaCommented:
you should install the agent on both servers and make a seperate schedule for both hosts.  if it does a failover you wouldn't have a backup.  
if the backup is succesful, logs will be removed on the online store and the replication will do the same on the mailboxcopy;  if you backup all stores in once it's best to create a script that makes sure all mbxstores are running on the same host.  otherwise it will give you a failed backup if one of the stores is mounted on the other server.  Or if you can make a seperate job for each store on each server.  there will always be one success (hopefully) and one failed.
that's how we do it for the moment.
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