I'm getting ready for a meeting next week to discuss decentralized storage for community archives: https://www.shiftcollective.us/ffdw
We are going to be talking in part about how Historypin resources can be redundantly preserved independent of the platform.
I put together a small tool called Pincushion which builds static sites for Historypin accounts, and we're going to put participants archives on personal thumb drives to seed discussion. https://github.com/edsu/pincushion