I would point out that you could just deploy the fleet to the colony and deploy it back to the starting planet, but I realize that it would cost more dueterium. I guess I support this.
resource saving is going to be totally different if this is the case. the game is setup such a way that u are responsible for your resource's management. play as it is. if a resource is left behind and u cannot deploy cargo ships for transfer then its your fault and u are at risk from getting raided. it is just how it is. adapt to it. every body else does it.