Bootable backups for Macs faced issues with macOS 15.2, but the recent 15.3 update fixed the replicator bug in SuperDuper. While bootable clones were once crucial, the rise of cloud storage and macOS's recovery features has diminished their necessity for many users. Current backup strategies, like using SuperDuper’s “Erase, then copy” or “Smart Update,” still serve backups effectively, but the need for rapid booting from a backup drive is less prevalent today. Users now rely on Recovery mode for issues, reducing the reliance on bootable clones, especially for those who aren't in high-pressure environments.
https://daringfireball.net/2025/02/bootable_mac_startup_drive_backups_and_another_ode_to_superduper