You need to self-host the dropbox-alternative (Score 1)

It is only secure when you put your hands all around it and have full control. There are products out in the market for you to self-host the solution. You can put a DNS name on your instance and all the data stays in your infrastructure. Check out Gladinet Cloud Enterprise - a Self-Hosted Dropbox Alternative Solution. http://www.gladinet.com/serviceprovider/selfhosteddropbox.aspx