You will likely need two or three files. There will be one for the CNC parameters and another for the PMC settings. There may be others, such as programs, macro, etc.
The O controls only used RS232. I recommend using NcNetLite from Cadem. It's freeware and works very well with the older controls. https://cadem.com/free-dnc-download/
PM me and I will send a procedure on how to restore the memory. The backup you have is from a long time ago. There will be changes.