i have ~24tb (6x4) unraided x3 on separate nas, one of which is only plugged in and turned on every few months. if i lose a drive, i can clone the whole thing quickly from one of the other 2 backups.. i dont have to worry about failed raid arrays and i get a bit more useful storage..

in the ~5 years i've had this setup going i think ive only lost one drive, and it started throwin smart errors long before it died