Edit after question clarification
In short you are asking the equivalent of:
"How do we deal with cleaning the sea water out of all the carpets on the Titanic if it runs aground on a sand bank? Iceberg? No no, that is not important, the grounding of the ship is just a plot device to get all the carpets wet; the ship does not sink. And nothing else on board the ship gets wet either. So, about those carpets...".
I think you can see now why you are not getting the answers you expected: the question relies on the wrong kind of plot device event in order to reach a specific scenario; a scenario that is entirely unrealistic and requires magic in order to happen; where you then hand-wave away all the primary consequences of this event in order to explore a secondary — or even less important — consequence.
Original answer follows...
That is not how it happens.
A geomagnetic storm does not cause an Electromagnetic Pulse in the same way that a high-altitude nuclear detonation does. An EMP causes a very fast spike in the magnetic field, while a storm causes relatively slow, but huge fluctuations in the field. These are very different when it comes to the damage they do.
What happens is that the power-grid soaks up the fluctuations in the magnetic field, and through induction this will cause massive direct currents in the power grids, which will wreak havoc on the grid and may cause damage. Any very long conductor (such as power-lines and pipelines) will be affected by this, and this in turn will affect anything that is connected to these long conductors. Transformers and high voltage power control equipment will be at risk. But computers are too small to be affected by the fluctuations directly, and they are too far away from the high voltage power grids.
If(!) what you really want is a plot device to knock out all computers all around the world, well then you are in for a bit of trouble. It would mean that you need to blanket all the inhabited parts of planet Earth with nuclear detonations.
But assuming this is somehow achieved, do remember that 90-95% of all CPUs in the world are not in computers... they are other electronic equipment. Even your credit card has a small CPU. So the problem will be that all our infrastructure is shot to pieces, because we rely on CPUs, micro-controllers and other such chips to make the stuff we take for granted every day — electricity, food, petrol, heat, cold, water — reach us. The only things that will really survive are the huge old industries, like power plants (and yes, this includes nuclear plants, they avoid reliance on electronics for precisely these reasons), forges, smelting plants and such. That is the real problem, not lack of computers.
How do we bootstrap all this? Well, do remember that CPUs have not been around very long. Modern CPUs have not been around for much more than 30 years. If we need to bootstrap all this, it will take us much less than that. The big problem will not be to start up manufacturing again for lack of information, but for lack of infrastructure to support it. Logistics will be shot because of this event.
Your question is a valid one but I am afraid it is The Smaller Problem™. We will be very busy worrying about other things, such as food, fuel, water, sewage, power, healthcare and so on.
Oh, and hard-drives will not be wiped by this by the way, nor will magnetic tape.
EDIT: What is the difference between an EMP and a geomagnetic storm?
The EMP causes a fast but very short-lived voltage spike. It is like you shuffled your feet on a carpet and then poked at your CPU. The "zap" is tiny, but it is likely to damage the CPU and put it out of commission. The EMP will cause such a "zap" in pretty much everything it reaches. The power grid-will also be affected by it but with the right safety equipment it can soak up the short-lived currents that this spike causes.
The geomagnetic storm by contrast causes large and long-lived direct currents. The voltage is small compared to the EMP but it is as if someone put a huge Earth-sized battery onto every power grid. Tiny things like CPUs will not notice this but the power-grid goes haywire because of this direct current, it is not equipped to deal with it.