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server before you proceed to take a backup. This is possible, but it s obvious that such a scheme is intensely manual, prone to error, and likely to cause disruption for users. It s a better idea to bite the bullet and invest in backup software that can handle the complete set of configurations that can exist in a DAG, including the potential need to back up public folder databases along with active and passive copies of mailbox databases. Check with your current backup software provider to ensure that the current version of your backup software is qualified to support DAG operations, heeding any advice that he might have about how to perform efficient backups and restores within a DAG.
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INSIDE OUT
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Passive database copies and active server load
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It can be desirable to make backups of passive database copies to relieve load off the active server . Some deployments group passive copies on a dedicated server that is only used for administrative operations and make backups only on that server, but this might not be possible depending on the number of passive copies that have to be deployed across the available servers in the DAG .
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As we discussed in the section covering Windows Server Backup, the truncation or deletion of transaction logs that are no longer required occurs following a successful full backup of an active database. After you complete a backup of an active database copy, the Replication service on the server hosting the active database communicates with the Information Store service to update it with the backup status. The Information Store notes that a successful backup has been performed and updates the header of the database with the information about the backup status, date and time, and so on. The header data are replicated along with other database updates to all the servers that host copies. Code in Eseback.dll then calculates which transaction logs are no longer required after the backup and removes them from the server where the backup occurred. The removal of these transaction logs on the active server is signaled to the Replication service on the servers that host database copies to allow the local Replication service to truncate the same logs on those servers.
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Restoring to a recovery database
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If you operate a DAG and experience a server or storage outage, you should be able to switch over to a database copy and continue to serve users while you work on the problem. The value of DAGs is expressed in that short sentence: Service continues despite a storage
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or server outage. Of course, this assumes that you have sufficient database copies in place to cope with the failure and that the failure doesn t knock out multiple database copies. If you don t operate a DAG and suffer a storage failure, you might need to revert to a recovery from backup.
INSIDE OUT
The realities of deleted items recovery
Windows Server Backup supports the recovery of Exchange 2010 databases to the same location from which they were originally backed up or to a different location. All of the databases and their transaction logs found on a complete volume are restored in both cases. Recovery to the same location is the approach to use when a disk has had to be replaced and you want to restore matters back to a point in time state. Recovery to a different location is the approach taken when you want to be able to access and retrieve data in one or more mailboxes in a backup set. This approach leverages a recovery database, the successor to the Recovery Storage Group (RSG) used in Exchange 2003 and Exchange 2007. A recovery database is a database that has been recovered from a backup to a location where it is accessible to Exchange. The recovery database contains disconnected mailboxes because they are not connected to Active Directory user accounts, but you can connect to the mailboxes to fetch data and move the data into mailboxes in regular databases to make the data available to users.
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