Our Mail/GroupWare service is migrating from Exchange 2007 to 2010 in
the next few months. Currently we employ streaming (Legacy) backups
across a private 2Gbit bonded private link direct to LTO5 tape and get
around 50MByte/s for fulls and around 16-20Mbyte/s for incrementals. In
all we have about 20TB of mailstore.

I've searched the threads and the user docs, developerworks etc etc but
can't find any real figures on how legacy versus vss backups compare. I
suspect they will be slower, because of the additional steps in the
whole VSS backup protocol but I'm happy to be surprised. If anybody has
any real world figures that address the questions below, I'd be truly
grateful.

1. Legacy versus VSS-assisted (MS VSS provider) backups of Exchange 2007
to TSM server.
2. VSS-assisted backups of Exchange 2007 versus 2010.

This is a big migration for all of us and I'd like to have an idea of
what we should expect in testing.

Thanks
Ian Smith
Oxford University/ England.