Where has all the usability gone?
Home data protection should be all about usability (assuming it works). I can understand that El Reg readers are a bunch of techies, but after years of (perl)scripting during your life – you get sick of building a new plane each time you want to fly (especially because you are the only pilot). While Time Machine addresses pretty much the backup usability aspect, I would expect that in the future there will be the ultimate file recovery interface – an advanced content based search.
Implementing similar solution for Windows does not introduce major technical challenges. The scary parts are the patents. What is the situation here?