So in this situation we’re talking about firmware packages for mobile devices. The files are not changed by clients, possibly the ‘smash’ software could download a package I missed on the master. I decide that manually and change the folder to send&receive temporary, or override.
By dividing the firmware in subfolders by device type and models we limit disk usage of the clients. There are a few nitwits who are smashing other types than synced. This setup itself is obvious a bit ‘dangerous’ as client A could manually delete the files and it will delete everywhere (except from master). But this responsibility is put on the operations themselves.
But it’s annoying that people start smashing a iPhone while the station was setup for Android in the first place. Then all android stations get iphone firmware… And that’s what I’m trying to figure out, I just caught one by live monitoring which client was synchronising after I did override on the server, but it’s a tedious job 
My apologies, for not searching fully through the forum, I just stubbed on Out Of Sync, but Who? which is a post of 2016, where a API endpoint has been mentioned.
Maybe there is a better way these days after 7 years?