Go to your personal gamesave, open the PARAM.SFO in the SFO editor and click advanced view. Take note of the account number.
Open the save you want to make your own, open the PARAM.SFO editor and find the new account number in advanced view. Go to the gamesave you want to edit, open the PARAM.SFO in a hex editor and search for the account number associated with it (that you found in advanced view for the new gamesave).
Search in hex format, paste in the account number that it's related to and when it highlights it, paste your own one over it. Then search for the same thing again, and paste your own digits in again (it's in there twice for some reason).
Basically, you wanna paste your account id number over the one in the gamesave you want. Then copy the whole folder into "HOME\000000X\savedata" the X will be your user.. If you only have 1 user profile it will be the only one in HOME folder, otherwise open the username file in that folder (000000X) in a hex editor (or press R3 in Multiman), which will tell you the username of the account you're pasting it into.
Thanks to RiPPERD for showing us how to do this!
oralphie: Will this allow chuck norris to play backups??? PLZ HELP!!!