That's an interesting idea that I've never thought about...

My first thought is that we should be preserving information instead of computational power, but that's a library.

Libraries are fine, but you need some way to store and and analyze raw data, and calculate simulations, and a computer is definitely needed for that.

A quick google tells me that the oldest functioning computer is the Harwell Computer, or WITCH and it looks like it needs a fair amount of somewhat advanced manufacturing to keep it in spare parts.

Just look at those dekatron things that it uses for memory!

I don't know where they dredged up spares of those things for the 2012 restoration