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I'd been thinking and I'd reach to the conclusion that a computer, with a Intel Core i5 (5th Gen onwards), 12Gb+ RAM and a SSD of 500GB would to the job, for everything I've been reading these last couple of days. I could even change the i5 for an old Xeon (seeing the benchmarks), which would be cheaper.
But from that last post of yours, I gather that there's no real point on setting up a server atm, unless I already have all the parts, because the network has enough servers and I'd be loosing time and money in electricity... Not what I was expecting, but if things are that way atm, not much I can do i guess
If you have the parts you should do it. There was never any real way to make any money running an electrum server unless people donate and very few people do as far as I know. I'll bet most of the people who use electrum don't even know how to get to the console tab to see what the remote server is saying or how to change what server they connect to.
It's a learning experience and having another electrum server and another full node on the network can't hurt.
It is also good for you if you want to use electrum and have a bit more privacy since you can set it to only connect to your own node.
Same with lightning I have a few nodes out there with a few channels open. Almost 0 use outside of me. But it's nice to have them out there and it has taught me / is still teaching me a lot.
Stay safe.
-Dave