您可以选择重用资源，或者直到需要时再购买资源，但是不再需要保留备用容量 “以防万一”。
The choice of whether to reuse or not pay until you need the resources is now yours, but you no longer need to have the spare capacity there, waiting for the "just in case" situation to occur.
调查发现，平均而言，管理员分配70%的服务器的内存给虚拟机(VMs)，保留30%作为备用。
The survey found that, on average, administrators allocate 70% of a server's RAM to virtual machines (VMs), leaving 30% in reserve.
电力公司总是保留一些备用发电能力，而在这用电需求突然下降的一个小时中，供电公司的涡轮发电机会继续工作，为一小时后的用电新高峰做准备。
Power companies always keep spare capacity and will keep their turbines spinning through this unpredictable fall in demand in preparation for when people turn their lights back on again.
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