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Nginx is pretty simple to run as a reverse proxy. Caddy is even easier but not as scalable.
HAProxy looks intimidating at first but it’s pretty easy and very scalable and performant. Wendell from Level1Techs has a nice writeup on their forums
Oh, there’s also Nginx Proxy Manager that is very clean and very easy to work and manage with it’s nice web UI
Hard drives, especially spinning discs, and RAM are probably the biggest factor at idle. I dropped my servers’ idle draw from 220w to 180w by dropping it’s RAM and replacing some older drives.