Quote from: o_e_l_e_o on Today at 10:17:27 AM

Could be. A sufficiently powerful quantum computer running Grover's algorithm can perform a brute force search in O(√n) functions, rather than O(n) functions as a standard computer would. This means that a 2¹²⁸ string could be brute forced in only 2⁶⁴ iterations. This is all dependent on very powerful quantum computers though, which are a long way off.

Quantum computers that use Grover's algorithm in the case of breaking symmetric encryption algorithms such as AES (Advanced Encryption Standard) are only able to weaken their strength or reduce all possible encryption keys to half.

In contrast, if a quantum computer solves an asymmetric encryption algorithm such as RSA, then a quantum computer can break it, especially for RSA-1024.

But in Bitcoin using the 256-bit ECDSA digital signature system, the possibility of encryption keys that can be done effectively Brute Force from 2²⁵⁶ to 2¹²⁸. So with the calculation capabilities of Quantum Computing and Grover's algorithm, it takes 2.6 x 10³² years.

Currently, it is still very unlikely to be used commercially, Quantum Computers are also tagged with very expensive prices such as D-Wave Systems products and some special licenses are needed because they are only used by a few large companies and research institutions.
https://www.dwavesys.com/solutions-and-products/systems/

Source:
https://en.bitcoin.it/wiki/Elliptic_Curve_Digital_Signature_Algorithm
https://www.section.io/engineering-education/aes-rsa-encryption/
https://www.csis.org/blogs/strategic-technologies-blog/encryption-security-post-quantum-world

Quote from: o_e_l_e_o on Today at 10:17:27 AM

I think people get too hung up on metal seed phrase storage, and it can actually lead to poor practices. Because of the expense of such devices, many people will just buy a single device and that will be their only back up. Only having one back up is a very risky situation, especially if that one back up is stored at home alongside the device(s) your wallet(s) are installed on. Two pieces of paper in separate geographical locations is safer (not to mention cheaper and easier) than a single metal back up.

Expensive because the materials used also support security (depending on how many assets are stored) it doesn't matter if the metal reserve costs hundreds of dollars but is used to store assets worth millions of dollars, it is not easily damaged and even withstands any conditions.

Actually, this is only optional for advanced security. Using standard security or more affordable ways is also fine, as long as the backup is in good condition.
Having 2 or more backups will help, but all of them must be secure and have full control.