Storing a passphrase digitally, even on an offline device, comes with inherent risks. Digital storage methods, such as saving a passphrase in a text file on your computer or on an encrypted USB drive, can be convenient but are not foolproof.
One of the main risks is the potential for the device to be compromised. Even if a device is offline, it can still be susceptible to malware or hacking attempts when it is eventually connected to the internet. Cybercriminals are constantly developing new techniques to breach security measures, and an offline device is not immune to these threats.
Additionally, digital storage methods are vulnerable to physical damage or loss. A USB drive can be lost or damaged, and a computer can malfunction or be stolen. In such cases, retrieving the stored passphrase can become impossible. Therefore, relying solely on digital storage is not recommended.