problems since upgrading to Snow Leopard

[ramtops]

I've had difficulties with SD since I upgraded my OS to Snow Leopard, and now it won't back up at all. I deleted the sparse image, and recreated it via SuperDupermwith no problem, so I'm sure the drive is OK, but whenever I try to backup, either via scheduled or on demand, I get "Failed to copy files from [machine drive] to [external drive].

I append the log, and I'd be grateful for some advice - it's fairly hairy running without backup

| 08:42:47 AM | Info | SuperDuper!, 2.6.1 (86), path: /Applications/SuperDuper!.app, Mac OS 10.6 build 10A432 (i386)
| 08:42:47 AM | Info | Started on Mon, Sep 7, 2009 at 8:42 AM
| 08:42:47 AM | Info | Source Volume: cottage, mount: /, device: /dev/disk3s2, media: Hitachi HDP725050GLA360, interconnect: Internal SATA, file system: "Journaled HFS+", OS: 10.6 (10A432), capacity: 465.44 GB, used: 175.01 GB, directories: 235809, files: 1537198, ejectable: NO, ACLs: Enabled
| 08:42:47 AM | Info | Target Image: /Volumes/superduper/weatherwax.sparseimage, name: weatherwax
| 08:42:47 AM | Info | Copy Mode : Smart Update
| 08:42:47 AM | Info | Copy Script : everything but VMs.dset
| 08:42:47 AM | Info | Transcript : BuildTranscript.plist
| 08:42:47 AM | Info | PHASE: 1. Prepare to Copy Files
| 08:42:47 AM | Info | ...ACTION: Preparing cottage
| 08:42:47 AM | Info | ......COMMAND => Verifying the integrity of volinfo.database
| 08:42:48 AM | Info | volinfo.database OK
| 08:42:48 AM | Info | ......COMMAND => Enabling permissions on cottage
| 08:42:48 AM | Info | Refreshing Disk Arbitration ...
| 08:42:49 AM | Info | ......COMMAND => Verifying that permissions are enabled for cottage
| 08:42:49 AM | Info | Permissions on '/' are enabled.
| 08:42:49 AM | Info | ...ACTION: Mounting weatherwax
| 08:42:49 AM | Info | ......COMMAND => Preparing weatherwax
| 08:42:49 AM | Info | ......COMMAND => Setting ownership and access modes for '/Volumes/superduper/weatherwax.sparseimage'
| 08:42:49 AM | Info | ......COMMAND => Mounting weatherwax
| 08:42:51 AM | Info | /dev/disk6 GUID_partition_scheme
| 08:42:51 AM | Info | /dev/disk6s1 EFI
| 08:42:51 AM | Info | /dev/disk6s2 Apple_HFS /Volumes/weatherwax
| 08:42:51 AM | Info | ......COMMAND => Mounting weatherwax
| 08:42:51 AM | Info | ...ACTION: Preparing weatherwax
| 08:42:51 AM | Info | ......COMMAND => Enabling permissions on weatherwax
| 08:42:51 AM | Info | Refreshing Disk Arbitration ...
| 08:42:52 AM | Info | ......COMMAND => Verifying that permissions are enabled for weatherwax
| 08:42:52 AM | Info | Permissions on '/Volumes/weatherwax' are enabled.
| 08:42:52 AM | Info | ......COMMAND => Verifying that weatherwax ACL support matches cottage
| 08:42:52 AM | Info | ...ACTION: Preserving Spotlight state on weatherwax
| 08:42:52 AM | Info | ......COMMAND => Disabling Spotlight search indexing on weatherwax
| 08:42:52 AM | Info | PHASE: 2. Copy Files
| 08:42:52 AM | Info | ...ACTION: Copying files from cottage to weatherwax using Smart Update
| 08:42:52 AM | Info | ......COMMAND => Cloning cottage to weatherwax
| 08:42:52 AM | Info | Copying copy files with delete using script: /Users/mac/Library/Application Support/SuperDuper!/Copy Scripts/everything but VMs.dset
| 08:42:56 AM | Error | ****FAILED****: result=11 errno=22 (Unknown error: 0)