Nintendo's Miiverse is dead. However, that doesn't mean that all your message board posts have disappeared into the ether. Drastic Actions and the Archive Team have launched Archiverse, an unofficial but very thorough collection of Miiverse posts. There are roughly 133 million posts, 217 million replies, 76 million screenshots and 72 million drawings -- all told, just shy of 17TB of data. It even includes developer-specific communities and the E3 communities that Nintendo delisted.
Source: Archiverse, Drastic Actions (Twitter)