Lets say you live in a world where the world government has decided people are getting too addicted to the internet and ordered the internet to be shut down for 5 years. The 100 GB of storage is all you have (excluding essential system files for your Operating System). You have 24 hours before the internet is getting shut down. What do you download?
If you were smart about it and had time to prepare, you could find a way to restrict the size of the Wikipedia download by eliminating things that are likely to also be in print books and therefore much less important to preserve. It might have to involve some sort of machine learning element.