Exchange Log File Deletion Question

I have Exchange 2010 running on Windows 2008. Due to backup issues, the log files (on the C: Drive, database on D: drive) have gotten out of hand and are causing the drive to run out of space. I'm running a full Windows backup of the Exchange log file and database folders. I know this will commit the log files and delete them, as I've done it in the past. My question is, once the log files are backed up, even though the database is still backing up, can I move some of those backed up log files off the drive to free up space or do they only get committed as or after the database is backed up? Thanks.
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Simon Butler (Sembee)ConsultantCommented:
You don't backup the log files.

You backup the database only, which will then flush the logs. A few logs are backed up as well (those created between the start of the backup and the completion) but that is all.

If you are doing a backup of the logs then you are wasting your time.

However either way, do not delete the logs yourself - the backup will complete and Exchange will flush them for you. It is only if something goes wrong and the flushing doesn't happen that you do anything else. Even then the usual course is to enable circular logging, let the logs flush, disable circular logging then immediately do a backup.


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GreenLeafProsAuthor Commented:
I'm not sure what you mean by  "you don't back up the log files." If you mean, in this particular situation because time is of the essence, then you're probably right. If you mean don't bother backing up the log files ever, I'd disagree because they can be used for disaster recovery. I've confirmed this is best practice from Microsoft.

And I've also confirmed from Microsoft that I need to let the database backup run its course and delete the log files on its own, as you stated. Thanks.
Simon Butler (Sembee)ConsultantCommented:
" I'd disagree because they can be used for disaster recovery. I've confirmed this is best practice from Microsoft."

Can you provide evidence of that?

Backups of the log files are not used for DR, other than the logs that I have indicated above, generated between the start and the finish of the backup.
They are completely useless, because after you have run a backup, they are committed and flushed. When you restore the backup they wouldn't be used.

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