To be worth while, this would require GUI support in the conversion and edit metadata dialogs. So that when doing a same fmt conversion the original is automatically archived, and the archived copy is automatically used if re-doing a same format conversion. And some sort of right click menu in the edit metadata dialog to restore an archived copy.
Open a ticket for it and I will see if I can add it into the 0.8 beta branch that seems to be developing at the moment (with a new metadata download system, last modified tracking and who knows what else).
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