Heard about this a few days ago on Twitter. There seemed to be a lot of conflicting information about what happened but this article from Vice explains it well:
"donk_enby had originally intended to grab data only from the day of the Capitol takeover, but found that the poor construction and security of Parler allowed her to capture, essentially, the entire website. That ended up being 56.7 terabytes of data, which included every public post on Parler, 412 million files in all—including 150 million photos and more than 1 million videos."
https://www.vice.com/en/article/n7vqew/the-hacker-who-archived-parler-expla...