Use a usb device or a card to back up your data. On the xmb go to game>game data utility (ps3). In here you'll see game save icons, select GT5 press triangle and then click copy, select where you want to save to. Saves are restricted to the same account.
For pictures load up gt5 then photo album, highlight the image you want to send to xmb press triangle and use the option export to xmb, you can also choose to export all to xmb.