I tried to install FreeBSD on the minimum RAM specified in the handbook of 96MB, but the installer fails (see image).
I tested using Hyper-V on Windows and VMware on Mac as those were the virtualization systems I had easy access to.
This fails for both i386 and amd64. It's possible some of our ARM architectures support less, but given this is generic entry I think it makes sense to gear towards the more common use-cases.
128MB successfully installs for me on i386 (1.5GB disk worked too).
128MB is not enough for amd64 (>164MB is at least required) but I decided to keep it simple at least for now.
PS. it's a while since I submitted a FreeBSD change, so that's why I'm doing the full review even for a relatively simple change.