I need to add files only, so remote host (which is receive only) should create files only once (not update it).
It means if local copy is damaged (updated) accidentally then remote copy will not be affected.
In normal situation files should be read and added only, so never updated or deleted. But I have to directly disable such possibility.
I can try to achieve that by FS permissions. But on Linux I have to run additional commands after file creation (not sure if Syncthing can do that), and not clear how Syncthing will work with IO error due to permissions.