I am a week into using Hyperoo, and it is a solid product. After seeding my first backup, I was able to backup
5 LIVE VHD's , about 328Gig of data in a little over 3 hours over an internet 10MBPS connection. The tech support is awesome, and the product is very solid. It is nice to have a standby server in a remote location, ready to go in case of an extended datacentre outage. It is worth your time to take this $79 program for a free test drive. It is licensed per server, so it does not matter how many VM' you have.
PS.. I would like to see an address and phone number on the website. GFI woudl be my second selection, from what I can tell it is around $395 per server.