Support Getting S3 replaced for S3..I don't want to loose my photos and videos. Help

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http://androidforums.com – I have 5 gigs of photos/videos on my S3 phones memory. I want to be able to take it out of the phone then onto my computer so when I receive my new S3 I can put them all back. I tried the drop box app but I ran out of space plus Im not sure if I can even transfer it back to the phone or I have to leave it in the cloud. Someone know? Im leaning towards getting a bigger SD card but I want to make sure Sprint will be able to transfer my 8gig sd card to my bigger 32gig sd card. Is that an easiest way? If there is a transfer app that is easy to use, can someone recomend? Maybe just c (General)