I think that intro (and the dead lemmy thumbnail) and the long part about reddit is why you got downvoted. People want to hear good things or constructive criticism about their niche platform and are kinda tired of reddit.
Try not to get discouraged about posting. I saw what you meant later in the article, it just came off badly from the intro materials.
I think single user instances and subscribing to communities doesn't really work with lemmy because of the low volume and overlapping communities.
I actually read all new on my instance and just block anything I don't want to see instead of subscribing. That was when communities come and go I still see the content. There are tradeoffs though you'll have to come back later to see lots of comments usually.
You claim to not be talking about AGI and then you immediately go on talking about Data from Star Trek as your example of a nonhuman intelligence. Clearly Data is AGI.
Nothing we have is anywhere near Data. It doesn't even have the potential to resemble the smallest aspects of Data.
Personally I have never seen an AI that even gets close to intelligence. A baby cat is infinitely more intelligent. I have no problem with accepting nonhuman intelligence that's not the issue here.
You need reasoning on novel problems to be intelligent not just rewording text from the internet.
I would detach one drive from the mirror first and make the raidz1 with the two drives if that's possible (not sure if it lets you create a pool in a degraded state)
There's different kinds of backups. For this you don't need off-site storage.
For this I set up zfs auto snapshotting which means when I delete stuff it isn't really deleted because a snapshot is still pointing at it until it rolls off the time window.
Both zfs and btrfs can do this but you do need to change the filesystem to use these which can be a lot of work.
Probably just go with SSD storage because 2T is fairly low for hard drives these days. Still a pretty good idea to do a mirror.
Pretty much any CPU that isn't a raspberry pi will comfortably max out a gigabit Ethernet connection.