At its core, CCC is a product that is designed to make backups of your Mac's user data, applications and system settings. In order for CCC to be able to make copies of system files (e.g. user accounts), CCC needs to have the privilege of copying files that can't be read nor written by just any user. Likewise, CCC is often tasked with copying the data associated with multiple users. macOS prevents you from accessing files that belong to other users. If you, as the administrator of the Mac, want CCC to back up everybody's files, then again, CCC requires elevated privileges.