It's an extremely interesting idea. However I'm not sure if the numbers work out. Most of the stable 'bits' are to be stored in magnetic topologies. Unfortunately these topological structures are spaced at extremely distances from each other, further more they decay and magnetic field lines close in time spans much shorter relative to self-organizing/replicating topological interactions than, for example, DNA base pairs.

I was doing research on a kind of self-organizing plasma structure called an FRC. One of our big results was that we could stabilize the FRC to last for 100 milliseconds before it unwound itself. We have to pump a fair amount of energy in to make it in the first place!