can I remove the beep speaker from apc easy ups?

Just cover its hole with some sticker/duct tape, this can almost completely mute it.

Server (Ryzen + 3 HDDs + 2 SSDs) - 50W

Networking (USG + Unifi AP + Mi router as a second AP + switch) - 20W, maybe a bit less

70W in total

I am using it for media server, Ubiquiti controller, torrents, sync and local http server.

Simply because it is a nice and simple front-end for Docker.