Go into the saves folder in your infitech instance and copy paste the world then? That should give you an exact duplicate. The re-create option at the single player menu should duplicate a world with the exact same seed too.
The re-create option gives me an option to revert to a backup of my world. I wasn't sure exactly how that would work and didn't want to mess with getting my current world backups corrupted because I reverted to a previous backup. I don't understand the backup system in this modpack at all, so not wanting to go there.
As for the copy/paste of the world I assume you mean I can make a new folder name so as to make it different and dump the data into that then? I'm not sure how that would work either. I don't mess with files on my storage system much nowadays, I used to know a lot but have no idea if any of it has changed much in Windows 10 from earlier versions of Windows. They still seem to be using the primitive MS-DOS filesystem method of 8 character names and assigning folders for Windows by adding extra data within the file system structure, along with a kludge that allows you to navigate using Windows folder naming conventions.
If the copy/paste is doable from within File Explorer, I might be able to not care about the details and try it that way.
Also, do you have the exact COFH command to use to clear non-ore blocks?
Cheers ...
BrickVoid