[Users] Backup virtual machines on ovirt

Hello, we are testing ovirt and RHEV in order to install both in our company instead of Vmware Vsphere. One thing we have seen, googling on Internet, there is nothing about backup virtual machines. I have seen Acronis as a backup solution but I found it too expensive for us at this moment. I'm thinking more something like ghettoVCB.sh <http://communities.vmware.com/docs/DOC-8760>on Vmware, a script that can connect to VCenter / Esx(i) and it's free of cost or a product with a not very expensive license. Thank you very much. Dani R.