I had a laptop running Windows for 12 years as my home server, hidden in a closet. It ran a couple of c# apps as a service and was an ftp server as well. Last month I decided to buy a raspberry pi (4B 2GB) to scratch multiple itches (arm processor, linux, low power consumption) and it replaced the server without a hitch, and better than I thought!

No weird splash screens from windows after updates, 2GB is vast for me when running headless, dotnet apps ported with minimal effort, and the list goes on. Only downside is the USB can only power one external 2.5" hdd, and I didn't want to add a powered usb hub.