I have liked EMC Retrospect since way back when I was a Mac user. (been a lot of years) I and one customer are using the Windows version, and it's great. However, I don't think there's a linux version of the program, and it now seems to be a Roxio Product. I worry about pricing on EMC Networker - it seems you to have to contact EMC or one of their vendors. Provantage has some modules for it, but I have no idea what I would need to get to back up windows and nix guests.