Shirt Pocket released SuperDuper 2.9, improving bootability of RAID clones and adding a preference to ignore copy errors induced by antivirus programs (which could cause SuperDuper to stop copying files; learn more at this Shirt Pocket blog post). The drive-cloning and backup app also preserves the Scheduled Copies window sort order between launches, fixes intermittent beach balls while the app is opening, and fixes a long-standing upgrade animation bug that prevented full update text from being visible.
Shortly after this release, Shirt Pocket updated SuperDuper to version 2.9.1 with official macOS 10.12 Sierra compatibility and improved quit speed when shutting down or restarting. The app now also requires 10.8 Mountain Lion or later, though version 2.8 (compatible with 10.7 Lion) is still available from the Shirt Pocket Web site. (Free for basic functionality, $27.95 for additional features, free update, 2.9 MB, 10.8+)