There is finally progress being made with SuperDuper Bootable Backups. Bootable Big Sur backups for Intel and M1. This is only for macOS Big Sur 11.4 beta and SuperDuper v3.4 beta 1. https://www.shirtpocket.com/blog/index.php/shadedgrey/comments/finally/ Hopefully when they release the next version of Big Sur SuperDuper will work as well as it did on previous versions of Mac OS's. Apple really threw a monkey wrench into the mix for SuperDuper & Carbon Copy Cloner when they released Big Sur. Looking forward when all returns to normal.