Hi, Dave - and thanks for all of the help!
I have no antivirus running on this machine. There's only the one drive on Firewire and no other FW devices at all. Here's the info about the target drive:
OXFORD IDE Device LUN 0:
Capacity: 74.53 GB
Manufacturer: Oxford Semiconductor Ltd.
Model: OXFORD IDE Device LUN 0
Removable Media: No
Detachable Drive: Yes
BSD Name: disk1
OS9 Drivers: No
Speed: 400 Mb/sec Speed
Unit Spec Id: 24734
Firmware Revision: MO4O
Unit Software Version: 10483
Server One Backup:
Capacity: 74.41 GB
Available: 73.95 GB
Writable: Yes
File System: Journaled HFS+
BSD Name: disk1s3
Mount Point: /Volumes/Server One Backup
I will send a log file to you shortly. I did go in with Disk Utility and actually had to repair this volume, so I'm trying the backup again. If that ends up fixing the problem I'll kick myself!
Steve