I'm using the online backup feature of Norton 360 v6. I discovered my older Turbo Tax files (those from 2008 and 2009) were being backed up, but not the ones from 2010 and 2011. Looking at the Financial File types and selecting Edit File Types nd then Configure so I can see the extensions being backed up, I see that the .tax2008 and .tax2009 are present but not .tax2010 and .tax2011.
I can manually add the .tax2010 and .tax2011 extensions, but it seems to me that they should be provided as the default. I doubt many people will look into these details, but rather will just assume when the select Financial Files that these will be backed up, but they won't be, and so they would not be able to recover them in case they needed to.