rsync question

[stan]

Given a freshly restored machine that has been out of service for a good
while, containing a large collection of data files "A", and "B" a in
service machine thta has a subset of these data files, but has some newer
files that are ont on "A". How can I invoke rsync such that only the new
filee are trnasfered from "B" to "A"?

I am confused by the large number of options to this program.

-- 
One of the main causes of the fall of the roman empire was that, lacking
zero, they had no way to indicate successful termination of their C
programs.