There is a .io domain name I want to buy when it becomes available in 12 months time.
What is the best tool to buy this automatically?
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[I realize this doesn't answer your question directly, but then my point is that the practical answer is that your chances of this working are not great.]
What makes you think the domain's going to become available at all? And that you'll get at it before people whose business it is to snatch up expiring domains? If you actually want the domain, versus being willing to just take a gamble on it, you're best off contacting the current owner about acquiring it from them. (I'm assuming there's something in the way of contact information or a form available.)
A direct offer at least puts you at the front of the line. Placing a backorder doesn't promise anything, least of all being the only one trying. And then if there are multiple people, you could end up in an auction, which is a whole other game.