Migrating to the live site went very smoothly except that reloading the database choked complaining of a duplicate entry. It turned out that we had a corrupt entry in one of the MySQL tables & nothing to do with JoomlaPack at all. Once this was deleted the restore proceded without incident.
I would thoroughly recommend JoomlaPack to anyone who is looking for a backup or migration solution for Joomla. We are promised automated scheduled backups in a future version which will make a great component even better.