Just curious..how is Mover moving TBs of wrong data? It should ideally be moving whatever you copied to some share via cache disk right?
Even if you accidentally copied some stuff which you dont want moved to the array, I dont think it should "trash" your array.
Lastly, (I think) if you engage midnight commander and quickly delete whatever data you don't want copied while it is still on the cache drive, it should prevent that data from being transferred over to the array.