We're probably going to take a route similar to Wikipedia, where we don't intend to be the primary repository of information. During the beta, we'll keep backups for a limited time (the past few hours) but that's it. In other words, we'd rather lose an hour of two of data than expose secrets to 3rd parties. We'll consider other options when we fully launch.
Note: this only applies to secrets data. Customer and related data is backed up as you'd expect.