[pct-l] Backing up pictures

[Alan Miller]

After reading the questions about cameras on the trail, I got to wondering
about what people do for backing up their pictures.  I would hate to have 4
months of pictures on my camera and then drop it a river or something.  My
camera is a point and shoot that takes an SD card.  I was thinking of
taking a few cards with me and sending them home periodically so that the
pics could be saved.  Another option I thought of was to upload them to
Dropbox when I get internet connection, but with limited bandwith in a lot
of places, I could see this being tough.  I also thought about carrying a
small portable hard drive, but I don't really want to add any unnecessary
weight.  What have you all done with your pictures while on the trail?