It runs on your PC. You will need to download and install this game update on your PS3. There were some bugs in the disc version that are very annoying. If you have a 4.20 system spoofer installed you won't need to edit the PARAM.SFO. If you don't have one you'll have to edit the PARAM.SFO for your disc backup and the one for the installed update
Code:
http://b0.ww.np.dl.playstation.net/tppkg/np/BLUS30784/BLUS30784_T2/89b2008df7a3f9c9/UP0367-BLUS30784_00-PATCH0100TO0101P-A0101-V0100-PE.pkg
After installing ftp/copy dev_hdd0/game/BLUS30784/USRDIR/EBOOT.BIN into the program directory I linked you to. Then run eboot_fix.bat. When it's done ftp/copy the newly resigned eboot back int dev_hdd0/game/BLUS30784/USRDIR. I just did it with my copy last night and it works great