For storage you can have DAS or NAS
NAS is independent from you PC, data I/O via network card, where
DAS is pretty fast with local system and you can share it - similar to NAS, but abit short of functionality for network storage
NAS you use freeNAS. Openfiler, OpenSamba, or ANY Linux OS to run a headless system, but pay attention to NIC - prefer to use Intel NIC.
where
DAS just install a 8x ports PCIE raid card like ATTO, Adaptec, HPT... you can have is as internal or external solutions
Which one do you need?