I have not lost position too many times, but I sometimes run a short file to mark the position -1, -1 about 1/8 inch deep.

Should you somehow need to set back up up / You can manually move the bot over to the -1, -1 mark, zero xy... and then move to 1, 1 and zero xy again.

This should put you back where you were within .001 or .002 which works well enough most times.