After you've uninstalled Google Drive for your Mac/PC, the Google Drive folder – including the files and folders it contains – will remain on your computer. At this point, you can delete your Google Drive folder and its contents without deleting anything in your Google Drive on the web

After you delete your account, it's possible that residual copies of your files could take up to 30 days to be deleted from our active servers and may remain in our backup systems for up to an additional 60 days.