I use Iphoto for managing photos on my Mac. Currently I have about 10,000 photos and a 40GB Iphoto library, which I assume is because Iphoto stores original copies of photos I edited. I backup my Iphoto library to Amazon S3. This ends up costing quite a but due to the size of the library. I could live with only backing up the edited version of my photos but have not yet found a convenient way to do this. I could extract all photos, but then I would lose the event...