There is no need to edit MOST survey data, once the crew understands the proper coding sequence.
There is also no need to purchase any editor for this, as simply exporting the edited point data, to a new TXT file effectively creates the NEW field to finish file, without harming the original survey data.
And no need to back up the TXT file as the surveyor would or should always have access to the RAW data file should the need arise to go back to the original unedited data.