Note: You must first sign up to use AeroFS. The hybrid cloud service is free for up to three users, and $10 per user per month for four or more users. The private cloud is $15 per user per month.
All AeroFS services can be deployed behind your firewall. You will always know exactly where your data is and who has access to it. It gives you unlimited storage in your own private cloud.
Simple to install. Simple to use. AeroFS.