This past week, my VPS hosting service had some sort of maintenance hiccup. The slave server stopped pulling changes from the master, and showed it was missing 4 hours of data changes.
I rebooted the slave, logged back into ERPNext and found that the missing deltas had already all been applied and the two databases were synchronised again.
I gotta say, after trying initially to see if there would be real interest in this toolkit, getting many positive responses and, consequently, doing all work, it is very disappointing that still no one has even tried it.