> > What error is Bacula giving? What errors are in the event logs?
> >
> > One thing - if Exchange is set to 'circular logging' then you will
> > have problems backing up.
> Not really. All circular logging means is that the old database log
files will be
> deleted before the next backup. In normal operation, these old log
files are
> never used anyway.

I should have qualified this with "the bacula Exchange plugin assumes
you have circular logging disabled and won't work if circular logging is
enabled ".

> 
> The only reason somebody might want to keep them is to allow restoring
the
> Exchange database to one particular point in time. Instead of the
traditional
> "restore the last full backup, and then restore the incrementals" you
would
> restore the full backup plus all the log files since then. Then you
replay the
> log files until the exact point in time you want.
> 
> In practical terms, most people never needed this capability, so
circular
> logging actually is perfectly fine.
> 

You are kidding right? Turning on circular logging limits your restore
options immensely. I've had numerous situations where a server has
failed (usually a power surge that has blown the UPS and the server)
leaving the Exchange database corrupt. With all the logs since the last
backup in place (because circular logging is disabled) you simply
restore the database. Exchange then starts up, notices all the logs are
still there and brings everything up to date. It's a no-loss recovery.
No mucking around with eseutil, no fretting over the weekends worth of
email you might have missed, it's all just there.

The 'restore to a point in time' was a useful thing in the past but it's
not the reason you would want circular logging disabled - retention
policies take care of recovering accidental deletions etc these days.

James

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