Mostly a NAS but with enough computational power to handle some of the machine learning and simulations I plan on throwing at it. Some headroom for OC is there too.
In terms of storage, anything larger that 8TB would likely be an overkill. According to BackBlaze (2018), those particular Seagate drives have low annualized failure rate (AFR; 0.97%) while at the same time being among the most tested drives they use (i.e., large sample size; n=14,384). The rig is sporting a RAID-Z2 (i.e., double parity) with a total available storage space of 20TB which is plenty for backups and research data sets.