Rsync how to include directories but not files?

Question

I have a directory structure and files like this

data/
data/a.txt
data/folder/
data/folder/b.txt
data/folder/folder/
data/folder/folder/c.txt
...
         


        

Answer 1

rsync -a -f"-! */" source/ destination/

Filter rule means "Exclude anything that's not a directory."