It can be done with much less actually. Complete AOSP upto Oreo requires about 95GiB for just the sources + 40-50GiB for each version build. But most of that

It can be done with much less actually. Complete AOSP upto Oreo requires about 95GiB for just the sources + 40-50GiB for each version build. But most of that repo history is not necessary if all you want to do is build one version. Just clone that one version to depth 1. Nougat weighed in at around 13-14GiB. Add the 40-50GiB for build, and about 70GiB is enough.