What would you consider a fair action on MS's part? In this scenario I'll consider it a given that you have traced the loss of all of your data to a bug that Microsoft agrees exists and did in fact destroy all of your data.
I don't expect anything (and should not actually). If I lose my data due to a bad backup/updates policy it is my fault.
The question is not about MS. I've picked Windows because it has a huge user base.
My initial statement is equivalent to: if you take any software product that has many users then its legal docs effectively leave no rights to the end users. So it is not a big deal when Facebook changes its docs accordingly.
I understand that software companies are forced to adopt such policies to survive.
Therefore I rely on MS' good will that it tests updates before it releases them to the general public (even if it breaks all Windows boxes one day, people will be using it anyway).
Maybe you replied to my comment by mistake, but in case you meant to reply to my comment and not to somebody else's, a lack of liability for destroying data is not even close to the same thing as a copyright license.