Does Dropbox keep a revision history of your 1password data? It does that by default with other files. If there is a Dropbox breach, I would want to prevent ha

Does Dropbox keep a revision history of your 1password data? It does that by default with other files. If there is a Dropbox breach, I would want to prevent hackers from getting their hands on older versions of my passwords locked with an outdated (eg, no longer top secret) master password.