Privacy with an Offline 4096 bits RSA Key on Paper

HavanaF writes: Online backup is practical but can it offer any privacy? The Dutch security company Safeberg developed an Offline Private Key Protocol, with an asymmetric key scheme. The protocol demands that the private (decryption) key should be stored away from the 'source' computer which presumably is "too vulnerable". The catch is that the private key needs to be fairly large to be secure: a 4.096 bits RSA key should suffice for some years. But how to store an 800 character key offline? Safeberg introduces a machine readable paper key, with the 4k bits key crammed in a giant 2D Datamatrix barcode. This video on key strength tells the story.