Before you can back it up, you need to know where it lives. The playerped.rpf file is located within the pc\models\cdimages folder of your main GTA 4 directory.
GTA 4 is notorious for being temperamental with modern hardware. If a modded character model causes an "SMPA60" error or a "Fatal Error" during loading, reverting to the original playerped.rpf is the only instant fix. Version Compatibility: gta 4 playerped.rpf backup
Alternatively, use a Mod Manager which can sometimes automate the creation of backups for modified RPFs. Importing Textures with OpenIV - GTAMods Wiki Before you can back it up, you need to know where it lives
Right-click the game in your library and select "Verify integrity of game files." This will identify the modified playerped.rpf as "corrupt" and download the original version for you. Downgrading Tools: If a modded character model causes an "SMPA60"
to test one mod at a time. If you install five mods at once and the game breaks, you won't know which one caused the issue.
Preserving Game Progress: The Importance of Backing Up GTA 4's playerped.rpf File