How much space do I need for Home Assistant?

32GB is the minimum recommended size.

How many cores does Home Assistant need?

Hass does not really need more than 2 cores and 1-1.5ghz on CPU. Unless you're doing a lot of image processing automations. May 29, 2019

How much RAM does Home Assistant use?

In fact, it's sitting at about 600 MB of RAM used (and it has other services running on it). Maybe they were talking about disk space and not RAM. Yep. I ran Home Assistant OS (then called 'Hassio") on a Pi3B and SD card for a year or so with no issues until… Dec 20, 2021