Source: How to make a laptop EMP proof: | Overclockers Forums
How to make a laptop EMP proof:
Info. 1) Let's begin with the laptop itself. Most companies use either a plastic or acrylic shell to encase the sensitive electronic components that actually make the device work. These types of shells are not EMP proof at all. There are two types of laptops that could stand up to a blast more easily: Mac and Toughbook. Both brands have models where the protective shell is made of either steel or aluminum, effectively acting as armor.
Info. 2) Simply having a metal laptop does not guarantee your computer's safety. You need to construct something called a Faraday Cage. This is a type of box with which you can place vulnerable electronic equipment. All the faraday boxes I have found are extremely lacking. So, I devised my own super-ruggedized version.
Step 1) Acquire a Pelican Case for your laptop. Find the right size model and order it. This is a Fire-Proof, Water-Proof (make sure you don't get a water-resistant one, you need water proof!), Corrosion-Proof, Bullet-proof, Shock-proof, and Freeze-proof case. Make sure it has the foam inside when you order it.
Step 2) Go to your local metal-shop and ask for some scrap pieces of sheet metal. You will need two large pieces for the lid and bottom of the Pelican Case and four smaller ones to cover the edges. You may be able to pay the mechanics to just make you some, cut to order. The sheets should only be about 1/8 to 1/4 inch thick steel.
Step 3) Acquire several rolls of thickened Aluminum Foil.
Step 4) Acquire several square feet of Copper Mesh with relatively small holes.
Step 5) Acquire some heavy duty Gorilla Glue.
Step 6) Installation - Coat the backs of the sheet metal and glue it into place inside the Pelican Case. This is your main EMP protection. (like a medieval knight's platemail)
Step 7) Glue several layers (up to 1/4 inch thick) of Aluminum foil all around and on top of the plates. (You shouldn't see the plates anymore.) To make it even denser, you may use a small weight (like a 5 lb. dumbbell) to gently compress the layers tighter together.) This is your computer's secondary protection, like the chainmail that would go under a knight's platemail.
Step 8) Glue several layers of Copper Mesh on top of the Aluminum foil. This is the final layer of EMP protection. (like a knight's leather pads) Entire buildings used to be covered in this during the cold war as an attempt to protect them from potential EMPs.
Step 9) Allow everything to dry. You may now place your foam back into the Pelican Case along with your laptop.
This system will protect not only your laptop, but also several external hard drives. You aren't going to have the internet, so stock up on as many songs, books, webpages, games, and video as you can. As an example, I currently have 3.75 terabytes of memory getting quiet full of survival info.
Total cost should run you between $150-$200.
How to make a laptop EMP proof
EMP proof laptop