iPhoto

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Back up your photos
Open iPhoto Select the photos you want to back up. Choose File > Export Make sure the File Export Button is selected

Change Kind to JPEG

Quality (I usually choose medium)

Size: I usually use medium unless you are planning to have any printed, then choose large)

File Name: The way the files will be named

Click Export Navigate to a folder and save them all in there. You can then move the photos to a CD or a Flash drive.

Import your photos
Open iPhoto File > Import to library Navigate to the folder where your pictures are stored. Import