Today's boilers are pretty reliable. I'm not sure it is worth the cost to keep that intact.
One thing you could do that may make sense (if you can leave it where it is) is to use it as a tempering tank - leave it off, but use it's output as the input to the indirect. In the winter, you'd have a warmer supply of water to heat. If you plumbed a bypass, you could turn it on and use it for your hot water if the boiler died. Still probably not worth the cost. It might make a difference, depending on your electric rates.