I mean, you can Google the requirements.

https://docs.nextcloud.com/server/latest/admin_manual/installation/system_requirements.html

However, it all depends on how many users you have, what apps you use, how much data you store, etc… Obviously you’re not going to be running AI photo recognition on decade old CPU.

I can’t help you, but Popey from the Linux Matters podcast recently talked about this with his Mini EV.

https://popey.com/blog/2023/09/using-bimmer-connected-with-my-mini/

https://popey.com/blog/2023/08/charting-ev-car-charging/