eby: I think drupal itself isn't a good preservation strategy. I'm happy to admit that I'm not an expert on drupal. But AFAIK, that's just not what drupal was designed for. Especially in a context like this, where you're creating an expectation of preservation for the community, I'd want the objects stored in a system that was designed for preservation and migration. Since that's not really that hard to do, it seems like a good idea.