Are you saying you lost your save state? Or preparing in the event that it does get lost it can be recovered? I've never heard of save states getting lost as a result of an update.
I checked my system to see if it had a save state backup system similar to the Wii where you could copy save states to an SD card and move them back again to get back to that restore point. However, all that I've found was the abililty to move the "channels" from system memory to USB. Nothing about save states.
So, I've not found a way to back up and/or restore save states. It would be nice if there was a way, like in the Wii.
EDIT: I dug a little deeper, picked USB-storage of data management, and selected one of the games in it. In there contained game data from eShop, update data, and the save game data for every user. If I selected a component, I could only delete it. Not move or copy it elsewhere. I could have chosen to move everything to system memory, but then that would delete it from USB and not be a viable backup.
The save state data is stored with the game and only movable, but not copyable.