SuperDuper scheduled backup is taking down my whole system...

[Marco_Polo]

Are you able to mount the network volume yourself? Does it work if the network volume is already mounted?

Yes and yes.

If I mount the volume from the Finder via "Connect to Server" and then run SuperDuper and have it execute the backup script then it will perform the backup normally with one exception.

The one difference is that I long ago edited the script so that it unmounts the image and network-volume when the backup has completed and it will not unmount them anymore.

The volumes can't be unmounted by simply dragging them to the trash, either. Checking with lsof, I found that Spotlight was keeping the disk image busy. After dragging the image's icon to the Privacy pane in the Spotlight pref's I was able to unmount it.

I have to drag the disk image's icon to the Privacy tab each time after I run the backup script. Spotlight "forgets" that it's not supposed to index the drive after each backup.

But that seems to be unrelated to the main problem and is of far less importance to me than resolving the other problem.