by Colin Fraser.
Reading my earlier comments, they are a little misleading, unfortunately, poorly worded. I make it sound like an either/or, but that is not the case. You can backup a course in v1.9 and restore to a v2.2.x without problems - but I would not include User data, just the course materials and files. To do this for every course can be very time consuming, if you have a lot of courses. In which case, I have done what I outlined there and will be repeating it in the next few weeks, for my second Moodle and do not expect any problems.