Ok, I verified that I can write out the export to a mapped drive on the network.
When I ran the script with "all" for exportNodes, it exported most everything, but did not export the IPA config. Unfortunately, I can't tell for sure whether it really exported all nodes except for the ProcessAutomation-related ones, or if it failed when it reached ProcessAutomation and quit running. There are at least 120 nodes, and the names that show up as valid in the command-line help don't exactly match the names in the export file (though the data seems correct), and I don't have time to verify every line.
If you want to do it up right, you should figure out which nodes you really want to export and do the comma-separated list.
My export file was over 450MB on a system with 10 users and stations when I used the "all" option, since it exports all .wav files and handler files (which include prompts).
Here is the PowerShell I used that worked for export to a mapped drive:
Start-Process -Filepath "D:\I3\IC\Migrator\ININ.Migrator.Console.exe" -Argumentlist '-export -noprompt -exportfolder="S:\Migrator\Export" -exportNodes="all" -customHandlerPath="D:\I3\IC\Handlers\Custom" -noprompt' -wait