You can have them ship them back to resort if you are staying onsite. We did this with our pics from our princess breakfast at Epcot. They even sent our frame that we had the princesses sign back, too.
If the OP means "not lose" the photos but keep them safe from suffering damage while the guests are out in the park...
the photos (and purchased merchandise) can be "sent to the front of the park"
and it will all be ready for pick-up as the party leaves that park.
This works well even if guests are not staying on WDW property.
If you are staying on property you can use the ship to resort for all of your purchases throughout the parks and downtown disney, just don't use this service the day before you leave, your stuff might not arrive before you leave. Instead use the option to pick up at customer service in the park.