Instructions
Plug in your USB flash drive to one of the USB ports on your PS3 console.
Turn on your PS3 console and go to the "Settings" menu in the system's Xross Media Bar.
Select "System Settings" from the "Settings" menu.
Select "Backup Utility."
Select "Back Up" and select your USB thumb drive as the destination to back up all of your game data to your thumb drive. You can then plug that thumb drive into another system and play your saved games.