I’m probably in a similar boat thanks to 4x NAS drives (in 2x mirror vdevs so essentially half as power efficient too). I wonder if using an SSD or two for things like caches would help with power draw since you could defer disk usage for longer by relying on a more efficient cache.

SnapRAID is also an option. One benefit is that multiple disks don’t need to be spinning at once to access data. Downside is that your parity isn’t calculated in real time so less data redundancy.

Yeah even if you’re someone who is super concerned about Jellyfin’s API safety, it’ll likely be less maintenance setting them up on tailscale than duplicating the streaming hardware. But that’s assuming OP’s family are as tech illiterate as mine

I have two 4TB in Raid 10 (ZFS Mirror) and two 8TB as the same. All in TrueNAS Scale.

TrueNAS is pretty good for a basic setup imo!