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I must admit that the idea of being allowed to have multiple copies of a book in the same format appeals to me, but off-hand I cannot see how it would work from a GUI perspective, and also what the database structure ramification might be.
An example of where I would add it would be where I add an ePub file and do not like the cover and so run an epub->epub conversion which currently overwrites the original. Being able to keep the original epub and the new generated one would be attractive just in case the conversion messes something up. It is also in line with the general calibre philopsophy of not changing things if not required.
I guess what I am asking is some way of marking a particular instance of a format as a "Master" that is not to be overwritten.
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