$session.GetFiles How to avoid overwrite destination

I'm scripting an FTP transfer via PowerShell script with $session.GetFiles: how to avoid overwrite destination?
In TransferOptions I can't see it..

Thanks

It seems that you want to synchronize. So use Session.SynchronizeDirectories.
https://winscp.net/eng/docs/library_session_synchronizedirectories

If you really want to transfer non-existing files only (even if the destination have older version of the file), set criteria to SynchronizationCriteria.None.

Perfect THNX!