[henk brouwer]

There should be some kind of drawback to mothballing, it's to easy to mass huge backup fleets now.

Ships that are mothballed for too long should receive some random damage, (no maintenance so it actually makes sense) or at least should need a short repair time before they can be used in action after being unmothballed ( maybe no actual "repair" but it should take a turn or two before the ships can be used again).