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@IRonMaN wrote:

I never make a copy of the file when amending, but I do keep a paper copy of the original.  Consider just saving a paper or pdf copy of the original return instead of dealing with the headaches of dealing with multiple copies of the same client.

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The directions to e-file a 1040X tell you to back it up to create a second copy.  It gave me the impression it was required in order to get it to e-file, but I could be wrong about that.