How does the Duplorcator save feature work?

[3dgamerman]

I haven't played this game in a long time, and I'm surprised to see that the duplicator has been replaced. It's been mentioned once when I was playing that you can save duplicates. How does this work?

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[3dgamerman]

Also, how do I stop uploading a save mid upload?

[otto-san]

duplorcator's /savedup and /loaddup functions are broken from my experience