Long indeed.
After many attempts, I have given up trying to get the original site to upgrade. The upgrade starts, then goes for a beer somewhere around doing the "files".
I did finally learn through experimentation that v2.x will happily 'restore' Moodle 1.9 course backup ZIP files, which I can then back up again as MBZ files, which is all this really needed to do.
Uploading personal files seems to support dragging and dropping multiple files into the upload box; uploading to where the course restore page actually wants to see them (private backup files) only supports one at a time. I have hundreds of schools, each with hundreds of courses.
When restoring the courses, I see that I can select multiple files in the list, but the only options I have for my selected files is to move them to another folder. I was really hoping one of those options would be "restore selected courses".
I can see that doing the uploads one click at a time will be quite time consuming; the restoring even more so because I have to click through several screens to make it happen.
Has any thought been given to make this just a little easier for one lonely non-technical admin to accomplish? Or is this such an unusual use case that it's not worth anyone's time to develop a solution?