Error Halted Backup!

[GadgetFan]

Tested one of my theories, and still fails the same way. I hope for sage advice tomorrow!

*couldn't change permissions on Macintosh HD, so I used Disk Uitlity to Erase it. Then I could change permissions in Get Info, so I tried setting it just like the other working (external) boot drives, namely:
You can: Read & Write
Owner: system, Read and Write
Group: admin, Read and write
Others: Read only

logged out and in again, holding down shift.
re-ran SuperDuper Again. Failed again, same as before.

Checked and SuperDuper had also re-set the permissions on Macintosh HD back where there were before:
You can: Read only
Owner: system, Read and Write
Group: suzanne, Read only
Others: Read only

Log follows:
[***] Tuesday, September 06, 2005 11:35:47 PM US/Pacific
|11:35:47 PM|Info| SuperDuper!, version 74, path: /Applications/SuperDuper!.app, OS: 10.4.2 (8C46)
|11:35:47 PM|Info| Source Drive: /, name: Sandbox, device: /dev/disk2s5 type: hfs, OS: 10.4.2 (8C46), capacity: 74.38 GB, used: 67.06 GB, directories: 78410, files: 329926
|11:35:47 PM|Info| Target Drive: /Volumes/Macintosh HD, name: Macintosh HD, device: /dev/disk0s3 type: hfs, OS: N/A, capacity: 74.41 GB, used: 0.04 GB, directories: 4, files: 10
|11:35:47 PM|Info| Copy Mode : Erase, then copy files
|11:35:47 PM|Info| Copy Script : Backup - all files.dset
|11:35:47 PM|Info| Transcript : BuildTranscript.plist
|11:35:48 PM|Info| PHASE: Volume Preparation
|11:35:48 PM|Info| ...ACTION: Repair Permissions on Sandbox
|11:35:48 PM|Info| ......COMMAND => Repairing permissions on Sandbox
|11:35:53 PM|Info| parent directory ./Users/Shared/SC Info does not exist
|11:36:27 PM|Info| Started verify/repair permissions on disk disk2s5 Sandbox
|11:36:27 PM|Info| Determining correct file permissions.
|11:36:27 PM|Info| We are using special permissions for the file or directory ./Library/Widgets. New permissions are 16877
|11:36:27 PM|Info| We are using special permissions for the file or directory ./usr/lib/php/build/acinclude.m4. New permissions are 33060
|11:36:27 PM|Info| The privileges have been verified or repaired on the selected volume
|11:36:27 PM|Info| Verify/repair finished permissions on disk disk2s5 Sandbox
|11:36:27 PM|Info| ...ACTION: Erase Macintosh HD
|11:36:27 PM|Info| ......COMMAND => Erasing Macintosh HD
|11:36:37 PM|Info| Journaling has been enabled on /dev/disk0s3
|11:36:37 PM|Info| ......COMMAND => Restoring Macintosh HD UUID (471053F3C7F67DB9)
|11:36:37 PM|Info| ...ACTION: Enable Permissions
|11:36:37 PM|Info| ......COMMAND => Enabling permissions on Sandbox
|11:36:37 PM|Info| Refreshing Disk Arbitration ...
|11:36:37 PM|Info| ......COMMAND => Verifying that permissions are enabled for Sandbox
|11:36:37 PM|Info| Permissions on '/' are enabled.
|11:36:37 PM|Info| ......COMMAND => Enabling permissions on Macintosh HD
|11:36:37 PM|Info| Refreshing Disk Arbitration ...
|11:36:37 PM|Info| ......COMMAND => Verifying that permissions are enabled for Macintosh HD
|11:36:37 PM|Error| Could not disable Ignore Permissions