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

Exchange 2010 DAG Backup

The term "Backup" means the methods and processes involved to copy computer data (system data as well as application data) to media other than the ones where the data originally live (disk, tape, optical, cloud). "Restore" in turn means the methods and processes involved in data recovery, i. e., bringing back copied computer data to their original location. Backup/Restore primarily serves as a means of protection against data loss, be it due to disaster, corruption or sabotage. It can also be used for recovering data from an earlier point in time and even for cloning machines or applications. There is a wide variety of backup/restore software available, from expensive commercial products to free or open source tools.

Storage Software

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.