Workflow for captions

I have read The DAM Book and am stuck on one concept dealing with captions. I am not a professional, so my use is 100% family at this time. During the download from the camera step, I can apply IPTC information (generally applicable to the majority of the images) using Photo Mechanic. So I have already modified the originals, but I don't see much of an option. BTW, I am hoping to download a demo of iView Media Pro this weekend. In my way of thinking, if I add captioning to the downloaded originals prior to editing them, the IPTC info will be in all versions of each image. I am thinking that once that is done, I would be ready to back up the downloaded originals, with the complete IPTC information, to DVDs. Is this a reasonable approach or is there a better workflow?

Thanks,
Rich