I agree with everything here. But I want to do a little nitpicking here

  > 7. Saves you from needing "cloud" storage or other cloud services.

So it means really the only solution is just buying a storage box. You can treat it as safety so doesn't need much egress, just to sync. But you should have something off site and "cloud" makes that much easier. But also, depends on how important that is. I'm not doing that with "pirated" content but I am with my content.

[0] 3 copies, 2 locations, 1 off-site. (All these are "at least")

[1] How is it easier to write a small bash script through termux to rsync to my home and another location than it is to do this with professional tools? For the love of god, it is a fucking trivial script and I can make it do whatever I want, like only backup on WiFi, only through tailscale, or even a specific WiFi SSID. Hell, I can get it to issue a command to my home server to sync with the remote server checking to make sure things match. For what, not even 100 lines in bash? It's a joke