The entirety of Wikipedia is only like 50GB. You can literally carry it with you on a thumb drive.
It’d be hell to actually view since that’s only counting the raw text info, but you could conceivably do it. If you include things like XML and edit history, that climbs to something like 20TB. A lot, but still technically possible. Especially if you compress it (which drops it down to like 200GB) and only decompress it when you need it.