Via @ikreymer, Web Archive Collection Zipped (WACZ) Format, https://github.com/webrecorder/wacz-format (MIT, potentially reusable)

Example of MDN WACZ at https://twitter.com/webrecorder_io/status/1293730279824089088

https://dh-preserve.sfo2.cdn.digitaloceanspaces.com/webarchives/mdn.wacz (1.6GB)

Finalizing Issue #604 (resolving #631) would be conducive here depending on the WACZ's contents. Also, hosting some larger WARCs remotely like this, because they are beyond the size restrictions on GitHub, could serve as the means for testing scalability.