We have created a number of areas and sub-areas in a Sharepoint portal
which we would like to move to a different farm.

Is there an easy way to do this? The only way I can see is to create
the areas with the Sharepoint SDK, so that the code used to create the
area is the same in both portals. I can't seem to find the options to
back up an area/sub-areas and then migrate them to another portal.