Everything that is on your ipod should be on your computer. You should be syncing your ipod to your comptuer regularly.
You need to make sure that EVERYHTING is on your comptuer.
The backup does NOT include any itunes content. if you have purchased anything on the ipod that is not on your computer then transfer it: File>Transfer Purchases
All pics taken with the ipod should be imported to your computer regularly as you would with any digital camera.