Ok, I finally have this resolved. I enabled circular logging and restarted exchange. I then disabled circular logging again, and restarted exchange again. It now works fine. However, I defintely had restarted exchange in the past, as the server has been restarted a few times. I beleive that the circular logging was on by default, but the tick box was never ticked.

FYI, this was a brand new build of SBS2003 with Windows Updated at build date (10 June 2004), plus Exchange SP1 installed before trying to configure Exchange backups.

Thanks
Daniel
"Michael Schipp" wrote:

> Ok, This should be set on the First storage group (if you havenot renamed
> it) from ESM. Note that if there is no tick on the (I think you said you
> already checked this) then maybe the exchange services have not been
> restarted since the change was made.
>
> Altering this setting require the info storage server to be stop and
> restarted.
>
> "Daniel Gentry" wrote in message
> news:ACE5E795-B1B2-441C-A1EF-88A968218D1A@microsoft.com...
> > It appears there are only 3, and the dates are from the last day or 2
> only. How do I disable circular logging then!!
> >
> > "Michael Schipp" wrote:
> >
> > > an easy way to see is if you have LOTS of 5MB files :) If you see only
> > > about 4 then it is on.
> > > "Daniel Gentry" wrote in
> message
> > > news:6EC4E758-07DD-4BB8-8C69-682A7B9F608F@microsoft.com...
> > > > Thanks Michael, I beleive Circular Logging is already disabled. Well,
> > > atleast the tickbox to enable circular logging is not ticked. However,
> my
> > > understanding is it is the default to have it enabled, but it was
> already
> > > unticked when I first checked this....is there anyway of verifying that
> > > circulart logging is really disabled??
> > > >
> > > > Or alternatively, any other suggestions?
> > > >
> > > >
> > > > Thanks
> > > > Daniel
> > > >
> > > > "Michael Schipp" wrote:
> > > >
> > > > > a possible reasion would be that you have curcular loggin enabled on
> the
> > > > > server.
> > > > >
> > > > > You can not use this loggin type for incremental.
> > > > >
> > > > > "Daniel Gentry" wrote in
> > > message
> > > > > news:527D4B1A-6CC7-4084-B780-D1F36C0956AB@microsoft.com...
> > > > > > Using "exchange aware" NTbackup that comes with SBS2003 I can
> perform
> > > > > online full (normal) exchange backups with no problem. However, if
> an
> > > > > Incremental exchange backup is performed it fails with the follwoing
> > > error:
> > > > > > Error: SERVER\Microsoft Information Store\First Storage Group is
> not
> > > > > > a valid drive, or you do not have access.
> > > > > >
> > > > > > Other people have this same problem, but no one in the newsgroups
> has
> > > been
> > > > > able to answer this issue. I need to be able to perform incremental
> > > backup
> > > > > due to location of backup over ADSL connection. Can someone please
> > > help!
> > > > > >
> > > > > > Thanks
> > > > > > Daniel
> > > > > >
> > > > >
> > > > >
> > > > >
> > >
> > >
> > >
>
>
>