Hi. Michael
This sounds a lot like take last doc I edited
We had over 7tb of HDV media (HDV is simpler as we edit with camera original)
We spread the media over 4 smaller FW drives, and had 2x duplicate systems,
So 8 drives in all.
We had a drive fail at some point mid-way, and we spent a day and a half copying its contents over from the dupe
I was cutting on one and an assistant worked on the other
They need to be constantly up dated as music and other media is added
There is software that can d this, but I’ve always done it manually
We kept our fcp projects on one drive, along with media
Renders from memory were also on the same drive.
We did have another copy of the media offsite (in another country in fact, where the on-ine was being done)
It doesn’t have to be difficulty you are sensible about it,
Good luck with the project
Nick