Veeam

Link for administering hyper-v machines on a free hyper-v system:
http://www.veeam.com/blog/rdp-rsat-free-hyper-v-server-2012-r2-remote-desktop-appliance-linux.html
Veeam free with powershell - http://www.veeam.com/blog/veeam-backup-free-edition-now-with-powershell.html
Find a list of all machines and if they are successfully backed up
Veeam free Powershell script