OK, maybe I should be asking this in some newsgroup about software or
archiving or something, but someone here must know the answer.

I backup radio production projects daily onto DVD+R with Nero Express.
Often I've had to update a large project with a new tag or added concert
date. I create new projects for each update usually so the only changes in
a large folder are often the folder date, a new (small) project file & one
or two new audio files.

I click No on replacing all the files that haven't changed, but this is
tedious and once you get a rhythm up there's the danger you might click No
on one has changed. There isn't a No To All type button. Obviously I'm
after software that will recognise and not add unchanged files to a DVD that
already contains an earlier version of the same project.

I have and use backup software elsewhere (that came with the drive), but
this only works on hard drives or rewritable disks formatted for drag 'n'
drop. I much prefer to backup important commercial work daily to write once
disks, having had my share of issues with flaky drag 'n' drop DVDs & CDs.

I'm using Sonar with per-project folders by the way.