Hmm, a perfectly reflective mirror is going to be difficult to come by; might it be more possible to make a sort of gravity bottle? In that case it might be possible to inject light into what amounts to space bent in on itself, so the light is traveling in an infinite loop. With this system no energy would be lost at all, and the capacity for storage could perhaps be limitless. Of course, constructing one of these containers would be really hard, and it would probably be difficult to do anything nearby. It would also have to be adjustable, because as you added a lot of energy it would get a gravity field of its own...
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