@@bemature3073 Tank has 5 litre capacity. If you keep tank full, then no need ups. Not sure if ups will support this m/c. In our home, we have not given ups connection to kitchen as there are heavy voltage appliances. Generally fan and light usage is good for ups.
Keep diaper into toilet & use water spray faucet w/ full force to remove motion, then you can soak insert and diaper in washing powder and wash. Make sure to sun dry. If there is yellow stain even after wash, will go away in sun dry.