The NSA backdoor is terrible in its own way (what business wants its documents to go straight to NSA?!), but remember this from a while ago? You now have to be careful what you keep in your own computer (privately), because if it goes straight to Skydrive, Microsoft might delete it:

"After contact with Microsoft support he found out that his account was blocked because there was a folder on his SkyDrive that contained content which was not allowed by the code of conduct of Microsoft SkyDrive. The folder was a private folder, not shared to anyone else.

Microsoft reserves the right to suspend an account for any reason, and two months of trying to fix the issue did not result in any resolution."

http://wmpoweruser.com/watch-what-you-store-on-skydriveyou-m...