As the article belatedly mentions, the ~40 GB automated tape library for HARVEST was the bee's knees... and possibly the inspiration for "harvest now, encrypt later".
PS – Primary sources for the IBM 7950/HARVEST on Bitsavers, excellent as always:
https://www.bitsavers.org/pdf/ibm/7950/
Decrypt later, I suppose.
Decrypt later, I suppose.