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If your Library folder in your home directory is backed up, everything OmniFocus touches is backed up. The Archive database is in the same folder as your database, ~/Library/Application Support/OmniFocus. The preferences file is at ~/Library/Preferences/com.omnigroup.OmniFocus.plist. It's possible that if you have the Mac App Store version of the app that these pathnames may not be correct, but they should be sufficiently similar for you to find them.