Newton with Linux
Step one: Get a serial to USB cable
- http://applenewton.co.uk/shop/ - http://applenewton.co.uk/2019/04/30/best-usb-to-rs232-cable-for-ncx-and-newtons/
You could build your own, like back in the day, or cobble bits together from Amazon or EBay, but this just takes the risk out.
Step two: Backup
NCU in VirtualBox