Things You'll Need
Instructions
Open Multiman from the home screen of your PS3. Insert the disk that you wish to back up into the drive.
Select the game that you just inserted from the Multiman main screen. Select "Backup/Copy" from the menu on the right and press the "x" button.
Select "Yes" when asked if you wish to copy the game to the internal drive. If the game is larger than 4 gigabytes, it will be broken down into 4-gigabyte portions and copied onto the external drive. Version 2.00.01 of Multiman will allow you to play these games directly from the external drive. If you are using an earlier version of Multiman, you will need to copy these files back onto your internal drive.
Wait approximately 10 minutes for 4 gigabytes of game information to be copied.