Fanless amd64 sytem recommendations

Hi,

My pcengines APU system died on me catastrophically. It's my primary
router / email / web server.

First, I built a Raspberry Pi 4b system with a USB wired NIC and went to
restore my backup from Google using rclone only to find that rclone isn't
supported on arm64. :(

I have built an old Dell desktop into a replacement, but I would really
like a silent system (fanless) and rclone is instrumental to my backup
system so I need to stick to (likely) an amd64 compatible system.

What recommendations do people have for a fanless AMD64 compatible system
that (ideally) has wired NIC's on it.

Thanks,
Steve Williams