A single bread incl. thumbs is about 10MB, can be up to 15MB.
Archiving bread and full-size images can easily go with a factor a 50-100 for size, depending what's posted (mp4s, pdfs, large images etc). I've archived breads incl full size images that were about 1GB.
My private (offline) archive of almost 11,000 breads (thumbs only) has about 100 GB.
That'd be roughly 10 TB (let that be a max estimate) if full-size images, pdfs, movies etc were archived.
Costs work, money & time and even more of all of that to put it all online.
Just saying …