Shirt Pocket Discussions - Backup fails verifying ACL support

As the following log shows, the full backup fails trying to verify ACL support. There is nothing in the documentation about ACLs so I don't know how important they are in the backup process. I have "Copy ACLs" ticked in the backup paramters.

The drive I am backing up to is a LaCie network drive (NTFS).

Can you please advise my best course of action?

Log as follows:
| 10:30:20 PM | Info | SuperDuper!, 2.5 (84), path: /Applications/SuperDuper!.app, Mac OS 10.5.5 build 9F2114 (i386)
| 10:30:20 PM | Info | Started on Fri, Dec 5, 2008 at 10:30 PM
| 10:30:20 PM | Info | Source Volume: Macintosh HD, mount: /, device: /dev/disk0s2, media: Hitachi HTS543232L9SA02, interconnect: Internal SATA, file system: "Journaled HFS+", OS: 10.5.5 (9F2114), capacity: 297.77 GB, used: 63.60 GB, directories: 152245, files: 586992, ejectable: NO, ACLs: Enabled
| 10:30:20 PM | Info | Target Volume: Davids Mac, mount: /Volumes/Davids Mac, device: /dev/disk1s2, media: Apple sparse disk image, interconnect: File Virtual Interface, file system: "Journaled HFS+", OS: 10.5.5 (9F2114), capacity: 297.45 GB, used: 54.65 GB, directories: 147728, files: 573852, ejectable: YES, ACLs: Enabled
| 10:30:20 PM | Info | Copy Mode : Erase, then copy files
| 10:30:20 PM | Info | Copy Script : Backup - all files.dset
| 10:30:20 PM | Info | Transcript : BuildTranscript.plist
| 10:30:21 PM | Info | PHASE: 1. Prepare to Copy Files
| 10:30:21 PM | Info | ...ACTION: Preparing Macintosh HD
| 10:30:21 PM | Info | ......COMMAND => Verifying the integrity of volinfo.database
| 10:30:21 PM | Info | volinfo.database OK
| 10:30:21 PM | Info | ......COMMAND => Enabling permissions on Macintosh HD
| 10:30:21 PM | Info | Refreshing Disk Arbitration ...
| 10:30:21 PM | Info | ......COMMAND => Verifying that permissions are enabled for Macintosh HD
| 10:30:21 PM | Info | Permissions on '/' are enabled.
| 10:30:21 PM | Info | ...ACTION: Repairing permissions on Macintosh HD
| 10:30:21 PM | Info | ......COMMAND => Repairing permissions on Macintosh HD
| 10:30:22 PM | Info | Started verify/repair permissions on disk disk0s2 Macintosh HD
| 10:34:34 PM | Info | Permissions differ on "private/var/log/secure.log", should be -rw------- , they are -rw-r-----
| 10:34:48 PM | Info | Permissions differ on "System/Library/LaunchDaemons/com.apple.usbmuxd.plist", should be -rw-r--r-- , they are -rwxr-xr-x
| 10:34:54 PM | Info | Group differs on "private/etc/cups", should be 0, group is 26
| 10:35:19 PM | Info |
Finished verify/repair permissions on disk disk0s2 Macintosh HD
| 10:35:19 PM | Info | ...ACTION: Erasing Davids Mac
| 10:35:19 PM | Info | ......COMMAND => Preserving Davids Mac UUID
| 10:35:20 PM | Info | 1DD1D3E8507B9128
| 10:35:20 PM | Info | ......COMMAND => Preserving spotlight indexing state
| 10:35:20 PM | Info | ......COMMAND => Erasing Davids Mac
| 10:35:55 PM | Info | Could not unmount Davids Mac for fast disk erase, defaulting to slower directory-by-directory erase...
| 10:35:55 PM | Info | ......COMMAND => Restoring Davids Mac UUID (1DD1D3E8507B9128)
| 10:35:55 PM | Info | 1DD1D3E8507B9128
| 10:35:55 PM | Info | ......COMMAND => Restoring Spotlight search indexing state on Davids Mac
| 10:35:55 PM | Info | ...ACTION: Preparing Davids Mac
| 10:35:55 PM | Info | ......COMMAND => Enabling permissions on Davids Mac
| 10:35:55 PM | Info | Refreshing Disk Arbitration ...
| 10:35:56 PM | Info | ......COMMAND => Verifying that permissions are enabled for Davids Mac
| 10:35:56 PM | Info | Permissions on '/Volumes/Davids Mac' are enabled.
| 10:35:56 PM | Info | ......COMMAND => Verifying that Davids Mac ACL support matches Macintosh HD
| 10:35:56 PM | Info | error (22) from /Volumes/Davids Mac. (Invalid argument)
| 10:35:56 PM | Error | ****FAILED****: result=5632 errno=22 (Unknown error: 0)