None, stop trying to hyper-converge everything. Synology makes nice storage boxes and their apps for backup are solid too. Leave it at that.

Check for firmware updates to the network card AND the UPS.

I had an issue recently where my 5PXG2 was claiming the batteries had failed after less than a year. I talked to support and they said update. As soon as I did, the errors cleared and the UPS started UPS-ing again.