Here is some of the console info from the last failed attempt. Hope it is not too much. The stuff at the end with the repeated errors seems worth noting.
Thanks again.
3/19/13 11:06:38.870 PM com.apple.backupd[21440]: Starting automatic backup
3/19/13 11:06:38.884 PM _softwareupdate[21446]: audit warning: soft /var/audit
3/19/13 11:06:38.885 PM _softwareupdate[21448]: audit warning: allsoft
3/19/13 11:06:38.886 PM _softwareupdate[21447]: audit warning: closefile /var/audit/20130320060412.20130320060638
3/19/13 11:06:39.869 PM com.apple.backupd[21440]: Backing up to: /Volumes/2TB Porsche/Backups.backupdb
3/19/13 11:06:42.000 PM kernel[0]: disk2s2: device is not ready.
3/19/13 11:06:46.000 PM kernel[0]: disk2s2: device is not ready.
3/19/13 11:06:46.000 PM kernel[0]: disk2s2: device is not ready.
3/19/13 11:06:46.299 PM com.apple.backupd[21440]: Error: (22) setxattr for key:com.apple.backupd.HostUUID path:/Volumes/2TB Porsche/Backups.backupdb/Katherine’s iMac size:37
3/19/13 11:06:46.300 PM com.apple.backupd[21440]: Error: (22) setxattr for key:com.apple.backupd.HostUUID path:/Volumes/2TB Porsche/Backups.backupdb/Katherine’s iMac size:37
3/19/13 11:06:56.313 PM com.apple.backupd[21440]: Backup failed with error: 2
3/19/13 11:06:57.265 PM coreservicesd[63]: Application App:"UserNotificationCenter" [ 0x0/0x12bc2bb] @ 0x0x7ff518470360 tried to be brought forward, but isn't in fPermittedFrontASNs ( ( ASN:0x0-0x2002:) ), so denying.
3/19/13 11:06:57.265 PM WindowServer[79]: [cps/setfront] Failed setting the front application to UserNotificationCenter, psn 0x0-0x12bc2bb, securitySessionID=0x186a7, err=-13066
3/19/13 11:08:33.668 PM WindowServer[79]: handle_will_sleep_auth_and_shield_windows: releasing authw 0x7fa398477350(2000), shield 0x7fa39921d4d0(2001), lock state 3
3/19/13 11:08:33.668 PM WindowServer[79]: handle_will_sleep_auth_and_shield_windows: err 0x0
3/19/13 11:08:33.670 PM WindowServer[79]: Created shield window 0x11ee for display 0x003f003d
3/19/13 11:08:33.670 PM WindowServer[79]: handle_will_sleep_auth_and_shield_windows: releasing authw 0x7fa398477350(2002), shield 0x7fa39921d4d0(2001), lock state 3
3/19/13 11:08:33.670 PM WindowServer[79]: handle_will_sleep_auth_and_shield_windows: err 0x0
3/19/13 11:08:33.671 PM WindowServer[79]: Created shield window 0x11ef for display 0x003f003e
3/19/13 11:08:33.671 PM WindowServer[79]: handle_will_sleep_auth_and_shield_windows: releasing authw 0x7fa398477350(2002), shield 0x7fa39921d4d0(2001), lock state 3
3/19/13 11:08:33.671 PM WindowServer[79]: handle_will_sleep_auth_and_shield_windows: err 0x0
3/19/13 11:08:33.671 PM WindowServer[79]: Created shield window 0x11f0 for display 0x003f003f
3/19/13 11:08:33.672 PM WindowServer[79]: handle_will_sleep_auth_and_shield_windows: releasing authw 0x7fa398477350(2002), shield 0x7fa39921d4d0(2001), lock state 3
3/19/13 11:08:33.672 PM WindowServer[79]: handle_will_sleep_auth_and_shield_windows: err 0x0
3/19/13 11:08:33.672 PM WindowServer[79]: Created shield window 0x11f1 for display 0x003f0040
3/19/13 11:08:33.672 PM WindowServer[79]: handle_will_sleep_auth_and_shield_windows: releasing authw 0x7fa398477350(2002), shield 0x7fa39921d4d0(2001), lock state 3
3/19/13 11:08:33.672 PM WindowServer[79]: handle_will_sleep_auth_and_shield_windows: err 0x0
3/19/13 11:08:36.320 PM _softwareupdate[21460]: audit warning: soft /var/audit
3/19/13 11:08:36.320 PM _softwareupdate[21462]: audit warning: allsoft
3/19/13 11:08:36.322 PM _softwareupdate[21461]: audit warning: closefile /var/audit/20130320060638.20130320060836
3/19/13 11:09:37.567 PM CVMServer[230]: Check-in to the service com.apple.cvmsCompAgent_x86_64 failed. This is likely because you have either unloaded the job or the MachService has the ResetAtClose attribute specified in the launchd.plist. If present, this attribute should be removed.
3/19/13 11:09:37.687 PM launchctl[21472]: launchctl: Dubious permissions on file (skipping): /Library/LaunchAgents/com.adobe.AAM.Updater-1.0.plist
3/19/13 11:09:37.688 PM launchctl[21472]: launchctl: Dubious permissions on file (skipping): /Library/LaunchAgents/com.adobe.CS5ServiceManager.plist
3/19/13 11:09:37.700 PM launchctl[21472]: launchctl: Dubious permissions on file (skipping): /Library/LaunchAgents/com.hp.messagecenter.launcher.plist
3/19/13 11:09:38.380 PM launchctl[21472]: launchctl: Dubious permissions on file (skipping): /System/Library/LaunchAgents/com.paragon.NTFS.auth.plist
3/19/13 11:09:38.467 PM CVMServer[230]: Check-in to the service com.apple.cvmsCompAgent_x86_64 failed. This is likely because you have either unloaded the job or the MachService has the ResetAtClose attribute specified in the launchd.plist. If present, this attribute should be removed.
3/19/13 11:09:39.679 PM _securityagent[21480]: audit warning: allsoft
3/19/13 11:09:39.679 PM _securityagent[21479]: audit warning: soft /var/audit
3/19/13 11:09:39.680 PM _securityagent[21481]: audit warning: closefile /var/audit/20130320060836.20130320060939
3/19/13 11:09:39.790 PM _securityagent[21483]: audit warning: expired /var/audit/20121220235916.20121221213650
3/19/13 11:09:40.467 PM coreservicesd[63]: Application App:"Finder" [ 0x0/0x19019] @ 0x0x7ff51914ee10 tried to be brought forward, but isn't in fPermittedFrontASNs ( ( ASN:0x0-0x12c02bf:) ), so denying.
3/19/13 11:09:40.467 PM WindowServer[79]: [cps/setfront] Failed setting the front application to Finder, psn 0x0-0x19019, securitySessionID=0x186a7, err=-13066
3/19/13 11:10:09.905 PM _securityagent[21491]: audit warning: soft /var/audit
3/19/13 11:10:09.905 PM _securityagent[21490]: audit warning: allsoft
3/19/13 11:10:09.906 PM _securityagent[21492]: audit warning: closefile /var/audit/20130320060939.20130320061009
3/19/13 11:10:12.236 PM mds[11308]: (Error) LSOF: File '/Volumes/2TB Porsche/.Spotlight-V100/Store-V2/865F9946-D56F-4355-B6D4-E6F776C7B07D/reverseDi rectoryStore' (fd=78) left open on device 16777225
3/19/13 11:10:12.256 PM fseventsd[47]: disk logger: failed to open output file /Volumes/2TB Porsche/.fseventsd/fc0074b9b5641344 (Invalid argument). mount point /Volumes/2TB Porsche/.fseventsd
3/19/13 11:10:12.262 PM fseventsd[47]: disk logger: failed to open output file /Volumes/2TB Porsche/.fseventsd/fc0074b9b5641344 (Invalid argument). mount point /Volumes/2TB Porsche/.fseventsd
3/19/13 11:10:40.756 PM _securityagent[21522]: audit warning: closefile /var/audit/20130320061009.20130320061040
3/19/13 11:10:40.789 PM _securityagent[21523]: audit warning: soft /var/audit
3/19/13 11:10:40.789 PM _securityagent[21521]: audit warning: allsoft
3/19/13 11:10:52.275 PM fseventsd[47]: disk logger: failed to open output file /Volumes/2TB Porsche/.fseventsd/fc0074b9b5641344 (Invalid argument). mount point /Volumes/2TB Porsche/.fseventsd
3/19/13 11:10:52.275 PM fseventsd[47]: disk logger: failed to open output file /Volumes/2TB Porsche/.fseventsd/fc0074b9b5641344 (Invalid argument). mount point /Volumes/2TB Porsche/.fseventsd
3/19/13 11:11:58.386 PM mds[11308]: (Error) LSOF: File '/Volumes/2TB Porsche/.Spotlight-V100/Store-V2/865F9946-D56F-4355-B6D4-E6F776C7B07D/reverseDi rectoryStore' (fd=78) left open on device 16777225
3/19/13 11:11:58.386 PM mds[11308]: (Error) LSOF: File '/Volumes/2TB Porsche/.Spotlight-V100/Store-V2/865F9946-D56F-4355-B6D4-E6F776C7B07D/reverseDi rectoryStore' (fd=122) left open on device 16777225
3/19/13 11:11:58.435 PM fseventsd[47]: disk logger: failed to open output file /Volumes/2TB Porsche/.fseventsd/fc0074b9b5641344 (Invalid argument). mount point /Volumes/2TB Porsche/.fseventsd
3/19/13 11:11:58.435 PM fseventsd[47]: disk logger: failed to open output file /Volumes/2TB Porsche/.fseventsd/fc0074b9b5641344 (Invalid argument). mount point /Volumes/2TB Porsche/.fseventsd
3/19/13 11:11:58.453 PM _securityagent[21535]: audit warning: soft /var/audit
3/19/13 11:11:58.454 PM _securityagent[21536]: audit warning: allsoft
3/19/13 11:11:58.455 PM _securityagent[21537]: audit warning: closefile /var/audit/20130320061040.20130320061158
3/19/13 11:12:14.000 PM kernel[0]: Sandbox: sandboxd(21546) deny mach-lookup com.apple.coresymbolicationd
3/19/13 11:12:21.564 PM authexec[21552]: executing /bin/sh
3/19/13 11:13:05.500 PM authexec[21585]: executing /bin/sh
3/19/13 11:13:05.507 PM _securityagent[21591]: audit warning: soft /var/audit
3/19/13 11:13:05.510 PM _securityagent[21593]: audit warning: allsoft
3/19/13 11:13:05.510 PM _securityagent[21594]: audit warning: closefile /var/audit/20130320061158.20130320061305
3/19/13 11:13:47.654 PM _securityagent[21628]: audit warning: soft /var/audit
3/19/13 11:13:47.671 PM mds[11308]: (Error) LSOF: File '/Volumes/2TB Porsche/.Spotlight-V100/Store-V2/865F9946-D56F-4355-B6D4-E6F776C7B07D/reverseDi rectoryStore' (fd=78) left open on device 16777225
3/19/13 11:13:47.671 PM mds[11308]: (Error) LSOF: File '/Volumes/2TB Porsche/.Spotlight-V100/Store-V2/865F9946-D56F-4355-B6D4-E6F776C7B07D/reverseDi rectoryStore' (fd=112) left open on device 16777225
3/19/13 11:13:47.671 PM mds[11308]: (Error) LSOF: File '/Volumes/2TB Porsche/.Spotlight-V100/Store-V2/865F9946-D56F-4355-B6D4-E6F776C7B07D/reverseDi rectoryStore' (fd=122) left open on device 16777225
3/19/13 11:13:47.689 PM _securityagent[21629]: audit warning: closefile /var/audit/20130320061305.20130320061347
3/19/13 11:13:47.690 PM _securityagent[21630]: audit warning: allsoft
3/19/13 11:13:47.706 PM fseventsd[47]: disk logger: failed to open output file /Volumes/2TB Porsche/.fseventsd/fc0074b9b5641344 (Invalid argument). mount point /Volumes/2TB Porsche/.fseventsd
3/19/13 11:13:47.707 PM fseventsd[47]: disk logger: failed to open output file /Volumes/2TB Porsche/.fseventsd/fc0074b9b5641344 (Invalid argument). mount point /Volumes/2TB Porsche/.fseventsd
3/19/13 11:13:50.123 PM iTunes[19563]: 2013-03-19 11:13:50.122618 PM [AVSystemController] Stopping AirPlay
3/19/13 11:13:56.046 PM authexec[21634]: executing /bin/sh
3/19/13 11:14:07.663 PM com.apple.launchd[1]: (com.apple.coremedia.videodecoder[21549]) Exit timeout elapsed (20 seconds). Killing
3/19/13 11:14:14.429 PM mdworker[21771]: Unable to talk to lsboxd
3/19/13 11:14:14.432 PM mdworker[21767]: Unable to talk to lsboxd
3/19/13 11:14:14.435 PM mdworker[21768]: Unable to talk to lsboxd
3/19/13 11:14:14.447 PM mdworker[21772]: Unable to talk to lsboxd
3/19/13 11:14:14.451 PM mdworker[21769]: Unable to talk to lsboxd
3/19/13 11:14:14.457 PM mdworker[21773]: Unable to talk to lsboxd
3/19/13 11:14:14.458 PM mdworker[21770]: Unable to talk to lsboxd
3/19/13 11:14:14.000 PM kernel[0]: Sandbox: sandboxd(21784) deny mach-lookup com.apple.coresymbolicationd
3/19/13 11:14:14.762 PM sandboxd[21784]: ([21771]) mdworker(21771) deny mach-lookup com.apple.ls.boxd
3/19/13 11:14:14.772 PM sandboxd[21784]: ([21767]) mdworker(21767) deny mach-lookup com.apple.ls.boxd
3/19/13 11:14:14.861 PM sandboxd[21784]: ([21768]) mdworker(21768) deny mach-lookup com.apple.ls.boxd
3/19/13 11:14:14.929 PM sandboxd[21784]: ([21772]) mdworker(21772) deny mach-lookup com.apple.ls.boxd
3/19/13 11:14:14.936 PM sandboxd[21784]: ([21769]) mdworker(21769) deny mach-lookup com.apple.ls.boxd
3/19/13 11:14:14.983 PM sandboxd[21784]: ([21773]) mdworker(21773) deny mach-lookup com.apple.ls.boxd
3/19/13 11:14:15.023 PM sandboxd[21784]: ([21770]) mdworker(21770) deny mach-lookup com.apple.ls.boxd
3/19/13 11:14:41.974 PM WindowServer[79]: CGXGetWindowEventMask: Invalid window 0
3/19/13 11:14:41.974 PM WindowServer[79]: CGXSetWindowEventMask: Invalid window 0
3/19/13 11:14:41.974 PM WindowServer[79]: kCGErrorIllegalArgument: rmdownEvProc: error setting window event mask
3/19/13 11:14:42.109 PM WindowServer[79]: CGXSetWindowEventMask: Invalid window 0
3/19/13 11:14:42.109 PM WindowServer[79]: kCGErrorIllegalArgument: rmupEvProc: error setting window event mask
3/19/13 11:14:50.042 PM loginwindow[42]: *** WARNING: -[NSImage compositeToPoint:operation:] is deprecated in MacOSX 10.8 and later. Please use -[NSImage drawAtPoint:fromRect:operation:fraction:] instead.
3/19/13 11:14:50.042 PM loginwindow[42]: *** WARNING: -[NSImage compositeToPoint:fromRect:operation:] is deprecated in MacOSX 10.8 and later. Please use -[NSImage drawAtPoint:fromRect:operation:fraction:] instead.
3/19/13 11:14:51.501 PM loginwindow[42]: Failed to write crash history to file://localhost/Users/jrg/Library/Application%20Support/CrashReporter/Finder_7 54E686A-A8B4-5A6B-9C1D-2E51044A8D8D.plist.
3/19/13 11:14:51.503 PM com.apple.ShareKitHelper[20920]: --warning: [ShareKit-XPC] Received XPC_ERROR_CONNECTION_INVALID
3/19/13 11:14:51.506 PM com.apple.ShareKitHelper[20920]: --warning: [ShareKit-XPC] connectionWithClientInterrupted
3/19/13 11:14:51.506 PM com.apple.ShareKitHelper[20920]: --warning: [ShareKit] Cancel UI for running services with Client PID: 307
3/19/13 11:14:51.510 PM TechToolProDaemon[60]: kCGErrorInvalidConnection: CGSGetCurrentCursorLocation: Invalid connection
3/19/13 11:14:51.510 PM TechToolProDaemon[60]: CGSGetDisplayBounds: Invalid display 0x00000000
3/19/13 11:14:51.511 PM TechToolProDaemon[60]: kCGErrorInvalidConnection: CGSGetEventPort: Invalid connection
3/19/13 11:14:51.511 PM TechToolProDaemon[60]: kCGErrorInvalidConnection: CGSGetEventPort: Invalid connection
3/19/13 11:14:51.511 PM TechToolProDaemon[60]: kCGErrorInvalidConnection: CGSGetEventPort: Invalid connection
3/19/13 11:14:51.511 PM TechToolProDaemon[60]: kCGErrorInvalidConnection: CGSGetEventPort: Invalid connection
3/19/13 11:14:51.607 PM com.apple.launchd.peruser.505[264]: (com.apple.Finder[307]) Exited: Terminated: 15
3/19/13 11:14:54.771 PM authexec[21796]: executing /bin/sh
3/19/13 11:14:54.778 PM _securityagent[21802]: audit warning: soft /var/audit
3/19/13 11:14:54.780 PM _securityagent[21804]: audit warning: allsoft
3/19/13 11:14:54.781 PM _securityagent[21805]: audit warning: closefile /var/audit/20130320061347.20130320061454
3/19/13 11:15:32.407 PM authexec[21932]: executing /bin/sh
3/19/13 11:15:32.413 PM _securityagent[21938]: audit warning: allsoft
3/19/13 11:15:32.416 PM _securityagent[21939]: audit warning: soft /var/audit
3/19/13 11:15:32.417 PM _securityagent[21941]: audit warning: closefile /var/audit/20130320061454.20130320061532
3/19/13 11:17:55.396 PM mdworker[21972]: Unable to talk to lsboxd
3/19/13 11:17:55.501 PM mdworker[21974]: Unable to talk to lsboxd
3/19/13 11:17:55.513 PM mdworker[21970]: Unable to talk to lsboxd
3/19/13 11:17:55.521 PM mdworker[21971]: Unable to talk to lsboxd
3/19/13 11:17:55.531 PM mdworker[21973]: Unable to talk to lsboxd
3/19/13 11:17:55.555 PM mdworker[21975]: Unable to talk to lsboxd
3/19/13 11:17:55.587 PM sandboxd[21982]: ([21972]) mdworker(21972) deny mach-lookup com.apple.ls.boxd
3/19/13 11:17:55.588 PM mdworker[21976]: Unable to talk to lsboxd
3/19/13 11:17:55.612 PM sandboxd[21982]: ([21974]) mdworker(21974) deny mach-lookup com.apple.ls.boxd
3/19/13 11:17:55.618 PM sandboxd[21982]: ([21970]) mdworker(21970) deny mach-lookup com.apple.ls.boxd
3/19/13 11:17:55.625 PM sandboxd[21982]: ([21971]) mdworker(21971) deny mach-lookup com.apple.ls.boxd
3/19/13 11:17:55.630 PM sandboxd[21982]: ([21973]) mdworker(21973) deny mach-lookup com.apple.ls.boxd
3/19/13 11:17:55.634 PM sandboxd[21982]: ([21975]) mdworker(21975) deny mach-lookup com.apple.ls.boxd
3/19/13 11:17:55.648 PM sandboxd[21982]: ([21976]) mdworker(21976) deny mach-lookup com.apple.ls.boxd
3/19/13 11:17:55.000 PM kernel[0]: Sandbox: sandboxd(21982) deny mach-lookup com.apple.coresymbolicationd
3/19/13 11:20:06.494 PM mdworker[21999]: Unable to talk to lsboxd
3/19/13 11:20:06.497 PM mdworker[22000]: Unable to talk to lsboxd
3/19/13 11:20:06.504 PM mdworker[21996]: Unable to talk to lsboxd
3/19/13 11:20:06.530 PM mdworker[21998]: Unable to talk to lsboxd
3/19/13 11:20:06.559 PM mdworker[22002]: Unable to talk to lsboxd
3/19/13 11:20:06.581 PM mdworker[22001]: Unable to talk to lsboxd
3/19/13 11:20:06.628 PM sandboxd[22008]: ([21999]) mdworker(21999) deny mach-lookup com.apple.ls.boxd
3/19/13 11:20:06.634 PM sandboxd[22008]: ([22000]) mdworker(22000) deny mach-lookup com.apple.ls.boxd
3/19/13 11:20:06.639 PM sandboxd[22008]: ([21996]) mdworker(21996) deny mach-lookup com.apple.ls.boxd
3/19/13 11:20:06.642 PM sandboxd[22008]: ([21998]) mdworker(21998) deny mach-lookup com.apple.ls.boxd
3/19/13 11:20:06.650 PM mdworker[21997]: Unable to talk to lsboxd
3/19/13 11:20:06.655 PM sandboxd[22008]: ([22002]) mdworker(22002) deny mach-lookup com.apple.ls.boxd
3/19/13 11:20:06.666 PM sandboxd[22008]: ([22001]) mdworker(22001) deny mach-lookup com.apple.ls.boxd
3/19/13 11:20:06.672 PM sandboxd[22008]: ([21997]) mdworker(21997) deny mach-lookup com.apple.ls.boxd
3/19/13 11:20:06.000 PM kernel[0]: Sandbox: sandboxd(22008) deny mach-lookup com.apple.coresymbolicationd
3/19/13 11:21:23.000 PM kernel[0]: Sandbox: sandboxd(22023) deny mach-lookup com.apple.coresymbolicationd
3/19/13 11:21:23.243 PM _securityagent[22030]: audit warning: allsoft
3/19/13 11:21:23.245 PM _securityagent[22031]: audit warning: soft /var/audit
3/19/13 11:21:23.246 PM _securityagent[22032]: audit warning: closefile /var/audit/20130320061532.20130320062123