Recently found a great migration tool that made my life easier when moving to Canvas and had to share because the efficiency and ease of use was way better (and way cheaper!) than what my organization almost went with.
It's Scaffold Migration from a company called K16 Solutions. Great integration and speed of course content transfer. They now also offer archiving as well, which was a huge deal for what we were trying to do. Again, way better (and way cheaper!) than having previous system (ie. for us it was Blackboard) archive for you and something I did not want to do internally.
Something to think about. I'm just not sure if anyone knows too much about this, but you should take a look if you're in this spot like my org was. Awesome new tech!