This all depends on how your LB is setup if you have a standard setup where every thing is on one drive then it is as easy as what @Cauptain said above just copy the LB folder and all content along with you roms (if they aren't in your LB folder) and it should just work if you have roms spread over multiple drives and LB has full paths to them instead of the relative paths it will use if its all on one drive then you may have to edit some games using the change rom folder for selected game option in the LB tools menu.