user237428934
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that's how picasa works too, it doesn't re-copy. However, since I don't like to rely on individual programs, I'd export my edited images to another data store, so assuming iview has any edit features, it would be a 2x + storage factor.
I realize you can possibly backup the database of data changes, etc., only, but then you're relying on iview. Not something I personally want to do.
How do you handle this today? Do you keep all modified versions of a file? Then it's not worse than today.