Need a peer to peer backup application for files on Windows XP, 7, 2008 and ideally WIn 8 and 2012

Hi We run world backups dot net and license software from other vendors (this costs). We want to provide a free peer to peer application to our users so they can back up non critical systems to one another's PCs \ servers on other sites or to a flat file server platform we own. We don't want an application built because this will take a long time, however I am willing to pay anyone who has used or owns a platform to meet these demands. These work well, but have limitations. Crashplan [login to view URL]