I just came across a major problem with Google Drive.
I have a Google Drive folder, it is syncing, there's no problem. I swap hard drives, clean install Windows and restore my user data, including the Google Drive folder and its contents from another drive. I then re-install Google Drive and it tells me that I cannot install the application because the folder is not empty. So a little more research leads me to the explanation that Google drive cannot sync with the existing folders and files, instead it has to start all over again and re-download and re-upload all of the files. What??
Talk about not being as refined as Dropbox. I think I will be going back to Dropbox and turning on the newly implemented 2FA.