linux - 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
...

a.txt, b.txt, and c.txt are large files that are computer-generated and renewed frequently. They should NOT be backuped -- but I want to backup the directory structure :

data/
data/folder/
data/folder/folder/

How can I do this with rsync and --exclude-from, without specifying every folder, but something like rsync -a data/* --exclude-from=exclude.rsync "" --onlyfoldersandnotfiles""?

Thanks for help !

Answer 1

rsync -a --include='*/' --exclude='*' source/ destination/

Basically, first include all directories, then exclude all files.