scp-ing without replacing folder

Question

How do I scp an entire folder into a folder of the same name without replacing the content in the destination folder? (instead, I would like to add to the contents of the destination folder)

Answer 1

Here:

rsync -azv -e ssh --delete --progress localdir/ user@remotehost:remotedir/

Note the trailing slashes — they're important.

(I have the first bit aliased to rsync-usual because I use it so often.)