If you live in an area where power outages can be a problem, then relying totally on electronic storage methods is unwise. We suffer quite frequent power cuts, especially in stormy weather. The "modern" supermarket has to close its doors immediately, because its computerised checkout system is off-line. The "old fashioned" corner shop, which uses a pencil and paper and an old mechanical till, is still open for business. There's a place for electronic systems, but total dependence on them is never a good thing, in my opinion.