"emergency backup" is a very strong, rational use, and should never be neglected.
replyYou can use cash but it mostly does not work in case of big chains or stores. They need to have access to their SAP/ERP software...It is not about payment for a long time.
replyRunning a generator to power a point of sale machine and maybe an offsite server is a lot easier than generators to power the whole electronic payment chain.
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