Copy (meaning you're copying it over your original game save on the PS3 hard drive). Just make sure not to get the two mixed up, I've accidentally copied my old game saves over my current ones
Before you cash in the ticket back up your save. Go to your gt5 save file and copy it to your usb. Load up the game, cash ticket. If you dont like the car quit game go to your USB copy the file from your usb. Try again.
I have my tickets on a separate account, You can send the tickets to your main account or to other users. After I send them I restore my game save thus never losing the ticket. If I send one to my main account I use a different jump drive to keep reloading the ticket until I receive the car I want.
hope this helps
When trading or receiving tickets I always have them sent to the separate account not my main one.