@Ibrahim_Taoube I sincerely apologize for not responding to this thread in a timely manner.
Right now, most reported duplicates are created during initial setup, when a previously-existing Google Drive (or Insync) folder is selected and re-used. This process may create duplicates in cases when Insync fails to match local items to those on Drive, which becomes more probable if the local items are out of sync with those on Drive.
We are currently actively working on improvements to Insync’s file matching algorithm in order to greatly lessen (and ideally, eliminate) duplicates created during setup.
In your case, do you experience duplicates being created outside of the initial setup process? If so, could you please send additional details to firstname.lastname@example.org so we may troubleshoot the issue in more detail?
Again, I really apologize for not responding sooner.