backup to "privat" public cloud with BEX2012

At first I do not mean a normal Privat Cloud as mentioned in http://www.symantec.com/docs/TECH172464

I would like to know if someone has tried to backup to a privatly build public cloud with the BEX2012 Network Cloud Storage option and what Software you used for that.

My Scenario has serveral BEX2012 Server that all should make a backup to our privat Cloud over the Internet without the use of VPN like you would do with Cloud Providers.