I'M CURIOUS IF THESE SYSTEMS WILL ENGRAVE LETTERING ACCURATELY WITHOUT BACKLASH?

The machines have minimal to no backlash depending on how you apply the machine. Since the cnc machines use roller chain on the x and y axes, and the roller chain is tensioned, the backlash is nearly eliminated. I say nearly because the if you control the machine in a way that there will be excessive load on the end mill, then the machine could have a tendency to spring to one side or the other because of the length of tensioned roller chain. The movement is minor and can be eliminated with the proper control of the machine.