iCall script to save the configuration to disk if any changes occur

We are facing a similar problem, and save-on-auto-sync was not the solution as it effectively killed the box on bulk changes (of data groups). So while I cannot answer your question (though by observation it seems that BigDB.dat is a valid reference file), I am also interested in a solution and thankful for your initial version (though 5 seconds is a bit too short for our setup).