Just a short note.
I have come across a weird issue. When you are trying to export your Management server configuration with migrate export (or upgrade_export, if you like doing it old fashion way), you have to make sure your machine is actually on the network. Trying to do this when it is disconnected will lead to the script failure.
I do not remember this kind of issue when working with R65, but it is definitely a case with R7X. Corresponding SK is sk63126.
Error message to look in the migrate log: Failed to get machine's IP address