I used to run one on a container on my dedicated machine. I stopped because running an electrum server was actually rather resource intensive, and i needed those resources for other things.

IIRC, you needed the full blockchain sync'ed and indexed (txindex=1), you also needed to download (or generate) a leveldb db for electrum. The total size of the bitcoind + electrum db was about ~150 Gb IIRC.
I ran it on a container, first i allocated 4 Gb RAM and 2 Vcpu's, but i upgraded the container to 8Gb pretty soon, and the performance still wasn't that great.
I'm pretty sure nowadays, you'll need at least 16, preferable 32 Gb of RAM, an SSD and 4 vCPU's to run everything smoothly. This wouldn't be a real problem, but you get no tips and no recognition to run an electrum server (at least, i didn't get a single thank you, nor a single tip)