moving bootable sd! image between 2 external drives?

[joemac]

hi d' and others...

i've got a 4 month old 100gb bootable sd! image on a 250gb firewire 400 drive

and would like to move it to a 120gb usb drive to store it off site.

1. do i just start up from the external sd! image and open sd! and then smart update to the 120gb drive?

2. or do i start up from the internal drive open sd! from it, then connect the 2 external drives, using the sd! image as source and the 120 usb as destination?

i know the drive capacity is tight, but nothing else will go on the 120gb drive , it's strictly a fail safe 3rd fall back thing.

thanks!
joemac