LOCKERSTOR 6 Gen 2 (AS6706T) Asustor 10gbe Card upgrade Advice

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Glad to help. Here are few 10gbe cards that they support:
ASUSTOR RJ-45 Copper Twisted Pair AS-T10G2
Intel RJ-45 Copper Twisted Pair I210-T1
Intel RJ-45 Copper Twisted Pair X540T1 & X540T2
Intel RJ-45 Copper Twisted Pair X550T2G1P5
Regarding drives, I would set up 3 individual RAID1s. This will ensure there is redundancy and faster read speeds.

Backing up from YouTube directly would not be possible unless you do this https://www.youtube.com/watch?v=f1z8VJhswSc

I hope this helps.