You’ll need a high-capacity external hard drive formatted to exFAT (as FAT32 cannot handle files larger than 4GB).
Games utilize a specific file called "keystone" to manage save data verification. Properly built FPKGs ensure that save games match the console's profile so players don't lose their progress. The Prerequisites: Jailbreaking and Firmwares
In many jurisdictions, creating a digital backup (PKG) of a game you already own for personal use is considered a "gray area" or falls under fair use for preservation. ps4 pkg roms
A common confusion: "Can I play PS4 ROMs on my PC via an emulator?"
This is the unavoidable section.
Storing an entire library of games on a high-capacity external hard drive or Network Attached Storage (NAS) system. How PS4 PKGs Work on Modified Systems
Encrypted files downloaded directly from Sony's servers. They require a valid license (rif file) tied to a PSN account to run. You’ll need a high-capacity external hard drive formatted
Official files downloaded from the PlayStation Store or found on discs. Fake PKG (FPKG):