USB devices don’t make any noise when you plug them in. I would make it play a smoke alarm low battery beep.

It doesn’t, but running everything through a tunnel to get IPv4 access would. OP wants only the IPv4 traffic to go over a tunnel.

My NAS uses a similar amount of power. The drives use most of the power. The PC uses less than 20W on its own. Upgrading to a couple of large helium filled drives will save a good bit of power. SATA drives tend to use a little less power than SAS drives too.

If you need IPv6, you can get a free tunnel from Hurricane Electric. They will give you a /48 if you request it. I used it for years since my old ISP didn’t have IPv6. I am close to one of their servers, so the latency was very low.

The software that can legally play a UHD bluray doesn’t even work with modern CPUs since it requires the SGX instructions. You have to get a specific drive that’s not made anymore, flash it with custom firmware and rip the movie with MakeMKV.

Almost every scam email I get comes from a gmail address. If a business is not sending emails from their own domain, I automatically assume it’s a scam.

No matter what adapter you use, you will be limited to the throughput of the PCIe 3 x4 port.

SATA is 6 gigabits per second, not gigabytes. The SATA adapter is only PCIe 3 x2 which would limit the throughput if you used it with SSDs, but it will still have plenty of bandwidth for hard drives.