Most efficient way to do multiple crops on many images?

I have a large number of images shot in the default 4:3 aspect ratio. I need to print almost 200 as 4x6, and and undetermined but certainly large number as 8x10, so I have a lot of cropping to do. What would seasoned Aperture users suggest as the most efficient way to do this? I've thought of two possibilities:
1. Duplicate every image I need to print in both sizes and crop one for each size print. This is the best option I've thought of, but it would certainly eat a lot of drive space.
2. Do all the 8x10 crops, revert to original, and do the 4x6 crops. Saves disk space, but leave me with only the 4x6 crop in Aperture. (Sounds like I want to have my cake and eat it too, I suppose.)
Anyway, there are a lot of you out there who have logged a lot more Aperture hours than I have. Is there a better workflow I have not considered?
Thanks,
Ben

Hello Ben,
the beauty of Aperture is, that you can have many versions of an image without needing much extra disk space.
To have three versions of an image cropped to different aspect ratios, don't create duplicate master images but use (from the Aperture main menu) "Photos -> Duplicate version" or "New Version from Master". Then crop this new version to a different aspect ratio. Aperture will not really render a new image file but just store the cropping rectangle to be able to create the cropped image when you export or print it.
So you can have an original version, a 8x10 version, a 4x6 version in your library without needing much extra space - that is one of the rare occasions when you can have your cake and eat it too
Regards
Léonie

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