What is the most cost-effective hardware configuration for maximizing capacity in a non-redundant plex server storage setup?

The most cost-effective approach for non-redundant plex server storage is a JBOD (Just a Bunch of Disks) configuration using high-capacity SATA hard drives.

Since you are bypassing data redundancy (like RAID 1 or 5) to maximize usable space, this setup treats each drive as an individual volume or pools them into one large virtual disk without parity. This ensures that every terabyte you purchase is dedicated strictly to media storage, though it requires a robust backup plan since a single drive failure will result in data loss for that specific disk.

https://hostyd.org/non-redundant-plex-server-storage/