I may be mistaken, but as far as I'm aware Google docs synced to your local machine are nothing more than links to documents in the Google Drive cloud. None of the data inside those docs is actually stored locally. I found this out the hard way when I decided to move away from GD and lost a lot of files.
Should you want to move from Google services, the best way of ensuring you keep your data is to use Takeout [1], which exports your documents as both doc and html files.
So buyer beware I guess.