Even without that philosophical angle, local backup is the only way for backup and restore a phone or tablet 1:1 (except Secure Enclave) as some bits are not ba

Even without that philosophical angle, local backup is the only way for backup and restore a phone or tablet 1:1 (except Secure Enclave) as some bits are not backed up on iCloud. (this can be seen once restored: via icloud authentication is stripped off, with local everything not relying on secure enclave or specifically tied to a device stays authenticated)