The way to get to a backlog is by not having made sales you could have made in prior years. So they shouldn't be equal in every way - the one with $0 backlog should have more cash, and that is probably preferable unless your business has diseconomies of scale.

Not sure. On one hand, a huge backlog means they're not meeting their demand. Operations may not be in order. Everything else is the same so sales and everything else is equal so I guess money is just deferred? Also huge backlog encourages competition and if you can't deliver, you're going to lose.

But such a big backlog suggests that they're underpricing. So it may be as simple as increasing price and ramping up your production, even though it would likely mean higher marginal costs.

Overall no one wants a backlog. It's not good business