It's not a bad feature. Reminds me though of Office and its relentless attempts to back up as you compose a new document. I guess if I was working on a thesis I might want an hourly backup of files, but I prefer to use images and system restore points generally.
if you are modifying a lot of documents from your %userprofile%\Documents folder it could be handy as we all get forgetful at times especially when concentrating on the work.