Thanks for the reply, Michael.  We have implemented single item recovery and it 
has eliminated the need to perform restores from tape in order to recover 
individual items for users.  However, as we lack a 2nd site, we still need to 
perform backups for disaster recovery purposes.  Your words of wisdom lead me 
to believe I should stick with those for the foreseeable future.


From: Michael B. Smith [mailto:mich...@smithcons.com]
Sent: Tuesday, June 14, 2011 3:27 PM
To: MS-Exchange Admin Issues
Subject: RE: Exchange 2010 using DAG Backup?

There are not "serious issues" with it. Anything that requires manual recovery 
requires extra care. That applies to using lagged copies for a recovery 
mechanism. However, lagged copies as a feature can be viewed as a "solution 
looking for a problem".

Lagged copies were one of the earliest features of E14 to be implemented (most 
of the ESE work gets done early in the development cycle, this is on purpose). 
And at that point, it made good sense. And MSIT used lagged copies as one of 
the ways to avoid making backups (along with multiple DAG copies, etc. etc.).

However, as development went on, SingleItemRecovery got implemented, and 
lo-and-behold - it can provide the same protection as a lagged copy, plus the 
user interface is trivial, plus it can also remove "plausible deniability" in a 
couple of situations without requiring a database restore.

So... MSIT switched over to SingleItemRecovery and that's what MSFT recommends.

I literally am not aware of a single company that has implemented lagged copies 
- and stuck with the feature. SingleItemRecovery costs a few percent more disk. 
But disk is cheap - especially when compared to the cost of an Exchange 
Recovery Specialist's time.

So...I have no idea if MSFT will continue supporting lagged copies in the 
future, or not. But if people aren't using a feature, and it's expensive to 
support - well, I'd remove it so I could spend my development and support 
resources elsewhere.

Regards,

Michael B. Smith
Consultant and Exchange MVP
http://TheEssentialExchange.com

From: Beckers, Shawn (IT Services) [mailto:sbeck...@csbsju.edu]
Sent: Tuesday, June 14, 2011 4:02 PM
To: MS-Exchange Admin Issues
Subject: RE: Exchange 2010 using DAG Backup?

Apologies for hijacking this thread, but this reminds me of a statement made to 
me by a consultant that I've been meaning to verify.  I mentioned to him that I 
was seriously considering using lagged copies to replace our current tape 
backups.  He told me that he had heard there were 'serious issues' concerning 
restores using lagged copies and that MS itself does not use lagged copies as a 
backup replacement because of this.  He then went on to say that he had heard 
MS was considering removing the ability to create lagged copies in a future 
version of Exchange and/or recommend the practice no longer be used as a backup 
replacement.

I find this hard to believe, but figured I'd ask those on the list that may 
have a little more insight.


To: MS-Exchange Admin Issues
Subject: Re: Exchange 2010 using DAG Backup?

On Tue, Jun 14, 2011 at 3:12 PM, Jonathan Link 
<jonathan.l...@gmail.com<mailto:jonathan.l...@gmail.com>> wrote:
Ya know, you really don't provide a lot of feedback about your environment.  Or 
what your needs are.  And your need isn't as simple as "we need a backup."
If I had a large enough environment, with some satellite offices, I'd think 
really hard about not running a backup and running a lagged server in the DAG.
I don't know if that will work for you, but it's something to consider.
On Tue, Jun 14, 2011 at 2:59 PM, sms adm 
<sms...@gmail.com<mailto:sms...@gmail.com>> wrote:
3 servers, no lagged copies.

Thx

On Tue, Jun 14, 2011 at 2:18 PM, Jonathan Link 
<jonathan.l...@gmail.com<mailto:jonathan.l...@gmail.com>> wrote:
The classic answer is, "that depends."

How many machines in your DAG?  Are you running a lagged copy on a member of 
your DAG?  I may be drinking the Kool-Aid, but large enough organizations could 
easily go without backups with the correct configuration.
On Tue, Jun 14, 2011 at 1:56 PM, sms adm 
<sms...@gmail.com<mailto:sms...@gmail.com>> wrote:
Exchange 2010 using DAG
How do you do your backup?

Thx in advance

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