I think it's also a good idea to repeat this testing procedure, say recover your coins, at least once a year.

January 3rd is Proof of Keys Day, so I'm expecting that everyone here still has it fresh in their minds...

Another good thing to mention is that you should definitely have alternative ways of restoring your coins.

Everything looks great in your digital backed up keys until you mistakenly format that PC, wiping the forgotten backup.

And everything looks great at your paper seed (or platinum etched ones), until your house is hit with a natural disaster like a flood and your seeds are never to be seen again...