Add a NAS unit to that cost and the recovery time, dire random access time to your estimations and it works out.

I’ve had to bounce around terabytes of crap on spinning rust for years. One nice XFS to XFS copy job took 2 days due to small files. Same thing on SSD was 3 hours.

I’ve also dealt with restoring a hosed 4 TiB NAS from another hard disk array. 4 days recovery sound like fun?