What’s been your experience so far with the new mini compared to the 2012 server? Was that the 2.6ghz quad core?
Yes, the 2012 Mac Mini server is the 2,6GHz Qauad core. It is still sufficient, but one of the two internal disks has an increasing "reallocated sector" count. I could change the drive, but that still leaves me with a 6 year old machine, which was up 24/7, beside that it would need some more RAM. I plan on booting it from an external SSD and using it for some not so important tasks.
I can't really compare them by now, as I am still in the process of setting everything up and have not much time to do so right now. In the process I will revise my whole setup, I am planning on switching from native applications to running some or all of the services which are not provided by macOS in VMWare Linux virtual machines or maybe docker. It will run openHAB, postgreSQL, influxdb and grafana, together with some python scripts, for my home automation. In addition it will provide my internal mail server (smtp and imap), an internal ftp server, a wiki, some file sharing and it will rut iTunes to play music via Airplay.
The new Mini is the i7 with 32GB RAM, 512GB SSD and an external 1TB Samsung T5, it could access more mass storage on a NAS.
What I can say so far: The new Mac Mini is really fast, even compared to the 2012 Mac Min, which is probably partly caused by the SSD in the new one vs. the spinning hard disk in the old one. While sitting on my desk during setup I could nearly never hear it and coile whining does not seem to be an issue. I still like the form factor very much, in particular with the internal power supply. I liked the old silver colour better, I can not comprehend while the LED doesn not indicate a sleeping Mac any more and the case is still slipping on my desk, but these points are not an issue for my use case, as it will finally be placed in my network cabinet in the cellar. Would I be planning on using it as a desktop machine I would miss the SD-Card Slot.
The case is noticable warm, but not in an extend, that it causes any concern. I can easyly touch it for longer times, it is probably only a few deegrees over air temperature. The air outlet is an other case. While connecting a USB drive I was surprised who warm the air is and I immediatly asked myself if this could be good for the cables connected to the rear. The outlett of the old mini was definitely cooler.
I can provide more details while setting up the mini, if you have any specific questions, please let me know!