Exchange 2010 DAG Backup (Full Version)

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Message -> Exchange 2010 DAG Backup (19.Nov.2009 8:44:50 AM)

Hi All,

I've been doing a hell of a lot of reading but, I can't seem find any definite answer to this question.

In a DAG configuration, do you still need to use a dedicated backup application to clear down the transaction logs? Or does E2010 clears the logs without first backing it up with another program?

Any thoughts would be much appreciated.


jveldh -> RE: Exchange 2010 DAG Backup (19.Nov.2009 9:05:56 AM)


You can use the standard Windows backup utility included with Windows 2008. When doing a full backup of the active node the logs should be cleared.

Have a look at this tutorial published on -> RE: Exchange 2010 DAG Backup (19.Nov.2009 9:24:00 AM)

Thanks for the prompt response Johan.

But, what I'm trying to find out is what happens if all your mailbox servers are in a DAG setup, do you still need to backup the active databases so that logs get cleared or does the exchange replication service clears the log automatically without having to run a backup program?


jveldh -> RE: Exchange 2010 DAG Backup (19.Nov.2009 10:56:47 AM)


Yes you will still need to backup the active one or enable circular logging which I do not recommend.

raghav123 -> RE: Exchange 2010 DAG Backup (19.Nov.2009 8:35:32 PM)

Hi Luke,

Exchange 2010 continuous replication coordinates log truncation across multiple database copies in a DAG. The continuous replication feature guarantees that logs that have not been replicated are not deleted.
Within Exchange, the Information Store service is responsible for truncating log files on the active database using the code found in either ESE.DLL or ESEBACK.DLL. Which DLL is used depends
on whether continuous replication is enabled and whether circular logging is enabled. If continuous replication is not enabled, then ESE.DLL is responsible for performing log truncation when circular logging is enabled. Otherwise, ESEBACK.DLL is responsible for log truncation.
When continuous replication on a database is enabled, ESE is initialized with the "do not perform circular logging" flag, regardless of the database’s circular logging setting. This is done because ESE-based circular logging is unaware of continuous replication. For continuous replication to work, log continuity is required
Therefore, logs cannot be overwritten until they are no longer needed by the replication engine. However, you can combine circular logging with continuous replication.


-Raghav -> RE: Exchange 2010 DAG Backup (25.Nov.2009 1:54:42 PM)

Thanks Raghav, that makes much more sense from what I have been reading but needed someone confirm it either way.

Thannks also to all who contributed.


Pantherfan -> RE: Exchange 2010 DAG Backup (26.Jan.2010 8:41:57 AM)

HI Johan,

I am curious about your statement, I know that circular logging was something that most of us Exchange folks despised in the past, but according the Microsoft's own Best Practices in a DAG they are recommending Circular Logging (while the old standard of backup truncating logs is recommended for NON HA configs).

Are you seeing different results in the real world? I havent deployed 2010 yet, and I know things dont always go according to Microsofts Best Practices hehe


ORIGINAL: jveldh


Yes you will still need to backup the active one or enable circular logging which I do not recommend.

jveldh -> RE: Exchange 2010 DAG Backup (27.Jan.2010 2:24:49 PM)


Yeah the way they describe it it's an option but I prefer to leave circular logging of just because it decreases the change of recovering a database.

RustyShackleford -> RE: Exchange 2010 DAG Backup (19.Sep.2013 9:29:47 PM)


When you reference "continuous replication" are you referring to the "Microsoft Exchange Replication" service on the MBX servers?

Thank you

Jason233 -> RE: Exchange 2010 DAG Backup (26.May2016 10:26:59 AM)

Cloudbacko Pro can give backup and helps restoring also i am basically using this software from long time and really satisfied using this software. Selectively backup emails, contacts and calendars of individual mailboxes

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