Can't backup boot volume to external

[cliffmac]

Same error on a clients MBP:
| 12:25:59 PM | Info | SuperDuper!, 2.6.2 (87), path: /Users/rterker/Utilities2/SuperDuper!.app, Mac OS 10.6.2 build 10C540 (i386)
| 12:25:59 PM | Info | Started on Sun, Nov 22, 2009 at 12:25 PM
| 12:25:59 PM | Info | Source Volume: Macintosh HD, mount: /, device: /dev/disk0s2, media: FUJITSU MHW2120BH, interconnect: Internal SATA, file system: "Journaled HFS+", OS: 10.6.2 (10C540), capacity: 119.69 GB, used: 108.57 GB, directories: 322970, files: 1203567, ejectable: NO, ACLs: Enabled
| 12:25:59 PM | Info | Target Volume: Super Duper backup, mount: /Volumes/Super Duper backup, device: /dev/disk3s2, media: ST910082 3A, interconnect: External FireWire, file system: "Journaled HFS+", OS: 10.6.2 (10C540), capacity: 99.69 GB, used: 99.68 GB, directories: 298240, files: 1119051, ejectable: YES, ACLs: Enabled
| 12:25:59 PM | Info | Copy Mode : Erase, then copy files
| 12:25:59 PM | Info | Copy Script : Backup - all files.dset
| 12:25:59 PM | Info | Transcript : BuildTranscript.plist
| 12:26:00 PM | Info | PHASE: 1. Prepare to Copy Files
| 12:26:00 PM | Info | ...ACTION: Preparing Macintosh HD
| 12:26:00 PM | Info | ......COMMAND => Verifying the integrity of volinfo.database
| 12:26:00 PM | Info | volinfo.database OK
| 12:26:00 PM | Info | ......COMMAND => Enabling permissions on Macintosh HD
| 12:26:00 PM | Info | Refreshing Disk Arbitration ...
| 12:26:01 PM | Info | ......COMMAND => Verifying that permissions are enabled for Macintosh HD
| 12:26:01 PM | Info | Permissions on '/' are enabled.
| 12:26:01 PM | Info | ...ACTION: Repairing permissions on Macintosh HD
| 12:26:01 PM | Info | ......COMMAND => Repairing permissions on Macintosh HD
| 12:26:01 PM | Info | Started verify/repair permissions on disk0s2 Macintosh HD
| 12:27:58 PM | Info | Warning: SUID file "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAgent" has been modified and will not be repaired
| 12:29:07 PM | Info | Finished verify/repair permissions on disk0s2 Macintosh HD
| 12:29:07 PM | Info | ...ACTION: Erasing Super Duper backup
| 12:29:07 PM | Info | ......COMMAND => Preserving Super Duper backup UUID
| 12:29:07 PM | Info | 64907E08FCBC80F2
| 12:29:07 PM | Info | ......COMMAND => Preserving spotlight indexing state
| 12:29:08 PM | Info | ......COMMAND => Erasing Super Duper backup
| 12:29:19 PM | Info | ......COMMAND => Restoring Super Duper backup UUID (64907E08FCBC80F2)
| 12:29:19 PM | Info | 64907E08FCBC80F2
| 12:29:19 PM | Info | ......COMMAND => Restoring Spotlight search indexing state on Super Duper backup
| 12:29:20 PM | Info | /Volumes/Super Duper backup:
| 12:29:20 PM | Info |****** Indexing enabled.
| 12:29:20 PM | Info | Indexing enabled on Super Duper backup
| 12:29:20 PM | Info | ...ACTION: Preparing Super Duper backup
| 12:29:20 PM | Info | ......COMMAND => Enabling permissions on Super Duper backup
| 12:29:20 PM | Info | Refreshing Disk Arbitration ...
| 12:29:20 PM | Info | ......COMMAND => Verifying that permissions are enabled for Super Duper backup
| 12:29:20 PM | Info | Permissions on '/Volumes/Super Duper backup' are enabled.
| 12:29:20 PM | Info | ......COMMAND => Verifying that Super Duper backup ACL support matches Macintosh HD
| 12:29:20 PM | Info | ...ACTION: Preserving Spotlight state on Super Duper backup
| 12:29:20 PM | Info | ......COMMAND => Disabling Spotlight search indexing on Super Duper backup
| 12:29:20 PM | Info | PHASE: 2. Copy Files
| 12:29:20 PM | Info | ...ACTION: Copying files from Macintosh HD to Super Duper backup*
| 12:29:20 PM | Info | ......COMMAND => Cloning Macintosh HD to Super Duper backup
| 12:29:20 PM | Info | Copying copy files using script: /Users/rterker/Library/Application Support/SuperDuper!/Copy Scripts/Standard Scripts/Backup - all files.dset
| 12:29:21 PM | Info | Loading 27 commands from copy script /Users/rterker/Utilities2/SuperDuper!.app/Contents/Resources/Copy Scripts/Exclude system temporary files.dset
| 12:29:21 PM | Info | Loading 6 commands from copy script /Users/rterker/Utilities2/SuperDuper!.app/Contents/Resources/Copy Scripts/Exclude system cache files.dset
| 12:29:21 PM | Info | Loading 1 commands from copy script /Users/rterker/Utilities2/SuperDuper!.app/Contents/Resources/Copy Scripts/Exclude Norton FileSaver files.dset
| 12:29:21 PM | Info | Loading 2 commands from copy script /Users/rterker/Utilities2/SuperDuper!.app/Contents/Resources/Copy Scripts/Exclude Google Desktop Index files.dset
| 12:29:21 PM | Info | Loading 1 commands from copy script /Users/rterker/Utilities2/SuperDuper!.app/Contents/Resources/Copy Scripts/Exclude iTunes Temporary files.dset
| 12:29:21 PM | Info | Loading 0 commands from copy script /Users/rterker/Library/Application Support/SuperDuper!/Copy Scripts/Standard Scripts/Backup - all files.dset
| 12:29:25 PM | Info | /
| 12:29:25 PM | Info | /.Spotlight-V100
| 12:29:25 PM | Info | Preserving /.Spotlight-V100
| 12:29:25 PM | Info | Preserving /.VolumeIcon.icns
| 12:29:25 PM | Info | /.vol
| 12:29:25 PM | Info | Ignoring /.vol
| 12:29:25 PM | Info | /cores
| 12:29:25 PM | Info | /Network
| 12:29:25 PM | Info | /Backups
| 12:30:44 PM | Info | /Previous Systems.localized
| 01:33:00 PM | Info | /private
| 01:33:03 PM | Info | Ignoring /private/var/folders/C5
| 01:33:03 PM | Info | Ignoring /private/var/folders/zz
| 01:33:03 PM | Info | Ignoring /private/var/tmp/.BlankFile
| 01:33:03 PM | Info | Ignoring /private/var/tmp/launchd
| 01:33:03 PM | Info | Ignoring /private/var/vm/sleepimage
| 01:33:06 PM | Info | Ignoring /private/var/run/vpncontrol.sock
| 01:33:06 PM | Info | Ignoring /private/var/run/usbmuxd
| 01:33:06 PM | Info | Ignoring /private/var/run/printtool
| 01:33:06 PM | Info | Ignoring /private/var/run/portmap.socket
| 01:33:06 PM | Info | Ignoring /private/var/run/mDNSResponder
| 01:33:06 PM | Info | Ignoring /private/var/run/com.apple.ActivityMonitor.socket
| 01:33:06 PM | Info | Ignoring /private/var/run/SCHelper
| 01:33:06 PM | Info | Ignoring /private/var/run/diskarbitrationd.pid
| 01:33:06 PM | Info | Ignoring /private/var/run/cupsd
| 01:33:06 PM | Info | Ignoring /private/var/run/configd.pid
| 01:33:06 PM | Info | Ignoring /private/var/run/DirectoryService.pid
| 01:33:06 PM | Info | Ignoring /private/var/run/.DSRunningSP1
| 01:33:06 PM | Info | Ignoring /private/var/run/pppconfd
| 01:33:06 PM | Info | Ignoring /private/var/run/pcscd.pub
| 01:33:06 PM | Info | Ignoring /private/var/run/mds.pid
| 01:33:06 PM | Info | Ignoring /private/var/run/com.apple.loginwindow.didRunThisBoot
| 01:33:06 PM | Info | Ignoring /private/var/run/automount.initialized
| 01:33:06 PM | Info | Ignoring /private/var/run/utmpx
| 01:33:06 PM | Info | Ignoring /private/var/run/sntp.log
| 01:33:06 PM | Info | Ignoring /private/var/run/ntpd.pid
| 01:33:06 PM | Info | Ignoring /private/var/run/hdiejectd.pid
| 01:33:06 PM | Info | Ignoring /private/var/run/racoon.sock
| 01:33:06 PM | Info | Ignoring /private/var/run/racoon.pid
| 01:33:06 PM | Info | Ignoring /private/var/run/racoon
| 01:33:06 PM | Info | Ignoring /private/var/run/syslog.pid
| 01:33:06 PM | Info | Ignoring /private/var/run/syslog
| 01:33:06 PM | Info | Ignoring /private/var/run/asl_input
| 01:33:06 PM | Info | Ignoring /private/var/run/resolv.conf
| 01:33:06 PM | Info | Ignoring /private/var/run/mds
| 01:33:06 PM | Info | Ignoring /private/var/run/.autoBackup
| 01:33:48 PM | Info | Ignoring /private/var/db/BootCache.playlist
| 01:33:48 PM | Info | Ignoring /private/var/db/volinfo.database
| 01:33:51 PM | Info | Ignoring /private/tmp/launchd-81.HOHVUy
| 01:33:51 PM | Info | Ignoring /private/tmp/launch-fIFigE
| 01:33:51 PM | Info | Ignoring /private/tmp/launch-1WNWlP
| 01:33:51 PM | Info | Ignoring /private/tmp/ics106
| 01:33:51 PM | Info | Ignoring /private/tmp/icssuis501
| 01:33:51 PM | Info | Ignoring /private/tmp/ics169
| 01:33:51 PM | Info | Ignoring /private/tmp/target2570.indexState
| 01:33:51 PM | Info | Ignoring /private/tmp/target4597.indexState
| 01:33:51 PM | Info | Ignoring /private/tmp/target5838.indexState
| 01:33:51 PM | Info | /Users
| 01:37:30 PM | Info | Ignoring /Users/rterker/Music/iTunes/Temp File.tmp
| 02:32:15 PM | Info | Ignoring /Users/rterker/Library/Application Support/Google/Google Desktop/Index
| 03:01:38 PM | Info | Ignoring /.hotfiles.btree
| 03:01:38 PM | Info | /.Trashes
| 03:01:38 PM | Info | /bin
| 03:01:38 PM | Info | /sbin
| 03:01:41 PM | Info | /System
| 03:12:40 PM | Info | /usr
| 03:16:27 PM | Info | /Library
| 03:43:56 PM | Info | /dev
| 03:43:56 PM | Info | /net
| 03:43:56 PM | Info | /home
| 03:43:56 PM | Info | /Applications
| 04:22:20 PM | Error | 2009-11-22 16:22:20.043 SDCopy[5906:613] NSExceptionHandler has recorded the following exception:
| 04:22:20 PM | Error | NSUncaughtSystemExceptionException -- Uncaught system exception: signal 10
| 04:22:20 PM | Error | Stack trace: 0x90004378 0x900a49bb 0xffffffff 0x900689bf 0x90068951 0x6c8e 0x5416 0x3405 0xa14d 0x2406 0x232d 0x10