On PC, you can manually copy your SaveGames folder to a USB drive or cloud folder (Dropbox/Google Drive) for personal backup. You can also edit save files using third-party hex editors (at your own risk—online features only check for cheat modifications in multiplayer lobbies, which are peer-to-peer anyway).
"Conquest Play Data" (active campaign progress) and certain Trophy data cannot be moved to the newer version. How to Transfer: Data Sharing option in the in-game settings to upload data from the PS4 and download it on the PS5. support.koeitecmo.info 4. Campaign Save Mechanics Exclusive Snapshots: Dynasty Warriors 9 Empires Save Data
This raises the save file from a technical necessity to a moral document. The data holds the weight of betrayal. The "Bond" system, a central pillar of the gameplay loop, forces the player to engage in the social logistics of war. A saved game represents hours of tea ceremonies, strolls through the castle, and gifts of gold. When a player loads that file, they are not resuming a game; they are resuming a web of obligations. To overwrite that data is to erase those bonds. To delete a high-bond officer from your roster is to sever a digital friendship that was purchased with the currency of time. On PC, you can manually copy your SaveGames