You put all the files on external (audio.psarc, textures.psarc, paradox eboot.bin, biogame folder, binaries folder from USRDIR folder etc) just like on internal basically all files from original backup except main.psarc.
Originally Posted by barelynotlegal
After main.psarc is done extracting it should make a biogame folder with like 4300 files in it, including a movies folder etc. put all these files in the structure they're extracted as onto external (do not overwrite because the original bioware and binaries folder each have a .bin file inside them)drag and drop. It also makes another binaries folder with a save folder inside do the same thing as bioware folder. Your game size will be around 25GB. You no longer need the main.psarc file (unless you want it as backup or if you plan on playing internal, extracted main.psarc should also work on internal as well) You shouldnt have a main.psarc file on external as it wouldnt copy all the way anyway (4gb+) because it's 10GB
It takes like 3 hours to do all this but it works.
PS3 Slim 4.21.2 Rebug REX 4.31 Spoof (external 1TB/3TB), PS2 Fat w/ Internal HD