Rsync is a protocol that is used to sync data between two different file locations. It's very fast because it only sends the data that is different.

At the command line enter this

setup-rsync

This will configure the rsync daemon to share out /storage read-only with no password

To list the files on your share you would use this command from another system

rsync rsync://<vortexbox IP>/files

If you want to change the way rsync shares your files you can edit the file /etc/rsyncd.conf