With that controller, you don't really have to know/worry about the backlash. This is only important when you reverse the direction of movement. You program your favorite direction in the parameters and work always in that direction. When you reverse, the controller will go past the desired position by the amount of steps programmed and re-approach the final position on the correct count. If in doubt, program a high value and it will be ok.
It depends what you are doing with the table. If you are simply positioning a work piece eg to drill holes in a plate, the friction of the movement combined with the backlash compensation will probably eliminate most of the backlash - although any non axial machining load may move the table within the unconstrained backlash angle, as there is nothing actually holding the table from moving. But worse than that, if you are milling a feature in such a way that the cutting forces try to move the table further in that direction, you may actually
double the total backlash by applying "compensation".
A similar-ish issue arises on linear axes when you transition from conventional to climb milling, which can happen simply by increasing the optimal load (width of cutter engagement). The forces on the ballscrew are reversed, yet the compensation isn't. You can feel this effect for yourself in manual milling in "conventional mode" - there comes a point where increased engagement results in negligible feed force being required and further engagement beyond that point results in the work "self feeding" or pulling itself into the tool. At that point if you have backlash, it will result in a sudden step feed into the tool as that backlash is suddenly taken up, which can be disastrous for the tool.
The bottom line is that you are much better trying to minimise / eliminate the mechanical backlash in the first place rather than hoping to rely on some "clever" software to magically dial it out for you.
