'materially-stored' originates from the combination of 'materially' and 'stored', where 'materially' refers to something in a physical form and 'stored' means kept or saved.

'Materially' and 'stored' have been used separately in English for centuries, but their combination into 'materially-stored' is a modern usage to describe physical storage.

Initially, 'materially' meant 'in a material form', and 'stored' meant 'kept'. Together, they now specifically refer to physical storage.