Following the presentation by Adam who screwed SkyDrive app (http://blogs.windows.com/skydrive/b/skydrive/archive/2013/09/30/skydrive-introduces-smart-files-in-windows-8-1.aspx#comments), I can conclude that since SkyDrive is using Smart Files and is only synching metadata, it's useless as a backup tool? What if an HDD crashes - does that leave anyone using SkyDrive with metadata and not the actual files?
What if HDD crashes before the user has a chance to make the files available offline? Or HDD needs to issue a warning before crashing?