I have personally talked to people that have lost everything during an in-line upgrade. It can take weeks to recover if you have lots of maps. I now avoid in-line upgrades which is your first pro-tip. In-line upgrades are about as smart as buying an off the rack suit that's six sizes too small and expecting it not to tear itself apart as you wear it while you're doing jumping jacks. Think that analogy is stupid? Well, it's still ten times smarter than an in-line upgrade.
Anyway, at one of these meetings of the minds one of the attendees asked it was possible to get the maps out of prime since that was the most difficult bit to replace. Turns out there is. I have been using it for some time as a way to mitigate a worst case scenario while attempting to migrate prime. This is what people commonly refer to as "upgrading prime".
Annnnnd....without further ado...
1. Click on the site maps link in Prime. In classic theme you go to Monitor -> Site Maps. In the devil's user interface or what Cisco refers to as "Converged Theme" you go to Maps -> Site Maps. There at the top center of the screen is a drop down box. Open it up and you will see...
Just select "Export Maps" and hit the Go button.
2. You will then be present with a screen that looks like this...
Only without all the lines covering location names.
You can export any or all of your maps. You can even export map info so that when you import the maps back into prime all of your access points will be where they are support to be. The one caveat is that you have to add your controllers back to Prime first. The access points have to be in the Prime database in order for Prime to add them back to the maps. Also, I have seen Prime 3.0. The process is essentially the same. The interface just looks a bit different. It's all schmancy now.
There you go. Pretty simple right?