Broken capacitor off of drive power board on ReadyNas Pro Pioneer

You should have that repaired, as the capacitor is likely there to a good reason (such as smoothing a signal or for the power line).  You cannot use the broken one as half of it was left behind on the board, but any competent electronics repair can source the part and fix it.  The capacitor is surface mounted but simple to change.  

The good news is that the way it broke off, it appears there's no damage to the underlying board.