I have over 100tb and that's after a huge consolidation of data. It's impossible to run a stock footage library on the cloud so I have two physical copies of every drive in the edit suite and another physical copy in a separate building in case...
I completely understand your frustration at the All-I situation. I can't imagine an All-I or even a ProRes workflow and the ungodly amount of storage it would take. I have over 20TB of storage just for my home video and I am trying to figure...