Thanks for your answer.
No, nothing else is attached to the FW port.
My external HD is a 250 GB LaCie d2 with triple interface.
When copying via the Finder, the transfer rate seems to be OK (a few seconds for a 450 MB iDVD project for example). I only seem to have this slowness problem when backing up my entire HD, whether via SuperDuper or Disk Utility.
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