How to use RSYNC without password
You can use /.ssh/ directory for placing your keys to access the zone.
If you're familiar with ssh keys, you can add your public key into /.ssh/authorized_keys and use extended rsync call like /.ssh/authorized_keys which has to be with 600 permission.
You can use for example this command to upload your public key to the CDN Storage (you will still need to use the password here):
rsync -va /path/to/your/public_key firstname.lastname@example.org:/.ssh/authorized_keys
And then this command to upload files to the Storage, without the need to use the password anymore:
rsync -e "ssh -i /path/to/your/private_key" /path/to/file email@example.com:/www/