PSP saves are encrypted with a unique key tied to the device? Not exactly—but they are bound to the save folder structure.
After every major session—after unlocking a new character, winning a Championship tournament, or buying a rare pack—make two copies of your save file. One on your device, one on your computer. This five-second habit will save you 50 hours of grinding. yu-gi-oh arc v tag force special save data
Your save data is your dueling legacy. It holds every perfect victory, every broken tag team strategy (Zarc + Raidraptors, anyone?), and every maxed-out relationship meter. PSP saves are encrypted with a unique key tied to the device