I've never done it myself but I copied this from a different thread hope it works for ya.
Create a file on your desktop named "PS3" and another file inside of that named "SAVEDATA". Download the file, unzip it, and put it in the SAVEDATA folder. You then put the PS3 folder and put it on your flash drive, and put it in your system. Go to your memory on your PS3 and find the file in USB or something like that. Find the file, and I believe it's triangle to copy it to your HDD. Then you should be Kosher.