30W should be enough, I have AP and couple of cameras, each consuming not more that few watts

I’m not sure if Ubiquity provides this level of telemetry, is there a reason why would you need to run it few time a day? In any case, you can always run WinMTR from your host.

Are your firewalls virtual/ hardware? What traffic goes where, what is site b, where is it? Where is proxy? Draw a diagram.

ILo updates were usually distributed in .bin files but that was in newer versions. Check vendor support site, it may be OS dependent https://support.hpe.com/connect/s/product?language=en_US&cep=on&kmpmoid=3984625&tab=driversAndSoftware