Recently had total disaster. My backup disk started flaking out. I reformatted, but before I could backup again, the disk containing all my Aperture masters died! I was able to restore some of the masters from an older backup, but there are still a lot of photos which have now disappeared to photo heaven. However, since Aperture kindly generated previews for all of my photos, I actually have decent quality jpegs even of these lost photos. My question is, can I at least export these jpegs so I have something I can share with my friends?