The massive archive of old Steam data circulating since late August is becoming a story about developers that are not Valve.
The community-run Steam2 Archive Catalog describes the collection as roughly 12TB from Valve's pre-SteamPipe content-delivery system, spanning about 2003 to 2013. Its current index says it covers 10,876 depots and 11.8 million files, including shipped material alongside builds that were never publicly released. The catalog hosts metadata, not the game payloads themselves.
