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Digital data and information storage is not a component of a software architecture? Of course it is, and anyone working on a similar project would need to include these layers in their architectural specifications.

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One could argue that software architecture is the inner structure of an application, i.e. the libraries, modules, classes, functions and, most importantly, their interfaces. The GOF design patterns are purely a matter of software architecture, for example.

System architecture on the other hand describes the different applications/services that compromise a system, including the ones that you write yourself, plus the ones that you just "use", e.g. database, storage, load balancer, etc.

I would argue that the article mostly talks about system architecture with focus on storage and I guess the parent you replied to would too.

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