Comment by a2tech

This is from the SuperDuper backup folks. SuperDuper is a tool that you can use to make bootable backups of your macOS system. Apple took away the ability for 3rd party tools to manipulate the OS and copy it to another partition/drive and took it upon themselves to provide that functionality via a utility. That utility is apparently non-functional in 15.2. So that breaks SuperDuper's ability to make a nice, clean, bootable backup of your Mac.