Thanks Jon / aussieboykie
I guess something similar can also be done using OneDrive (see below)
However, as said, I am not sure about the performance when using a cloud service.
Some time back I gave it a try synchronizing folders with a number of folders, sub-folders and quite a number of files. I did some renaming and deleting, i.e. nothing strange, the usual stuff I would do on my desktop.
It took a lllong time (hours) to synchronize, reason why I am looking for alternatives.
In the meantime I went on and did some 'research'. Some 'sync' tools can do this over WiFi.
Drawback - they may not always be free of charge.
Like: SyncBack Touch or Allway Sync. Allway Sync , for personal use, is free of charge I believe.
BTW - just saw that Touch is just 10 dollar for a limited period. I gave SyncBack Touch a try and synchronizing is fast. In my case, with a fast WiFi that is.
Anyway, thanks again.