rsync option

[Paco Martinez]

Estimated gurus.

I have a server A with 5 files, and I make a rsync to other server B of
these 5 files.

Imagine that in server A number of files are increasing, and server B are
not increasing but I just like to make rsync of these 5 files from A to B,
none file else.

Is there any option in rsync to "copy" or "send" files fron server A to
server B, owing to replicate only files that are in server B ??

Thank you !!!