For a NAS, you're usually concerned with capacity first. And you can't buy a 20TB m2.
CalicoJack
Yeah, this is specific to the Google Messages app. For now, anyway.
I've had this happen a couple times, and contacting the seller directly has gotten it sorted out. Even if they seem sketchy, they don't want to take a hit to their reputation. If they don't want to help, I'd escalate to eBay support.
If neither of them work out, then I'd try contacting WD. A refurb with no warranty is better than nothing at that point.
A Zero would probably be way underpowered for the job. I've used a Pi 4 in the past and it worked ok, but choked occasionally.
My actual recommendation would be a small x86 box, something like a Lenovo Thinkcentre Tiny. You can get them used for about the price of a Pi, and they'll be much more reliable.
They're referencing the TRaSH Guides, a great resource for setup and basic tuning of an *arr stack. It's where a lot of people get started.
A lot of US banks also have that as an option, people opt in to "overdraft protection" anyway. The banks make it sound like a safer option, instead of the predatory practice it normally is.
It isn't just the cover art, they also A/B descriptions. And some of them are so different they're basically lies.
Automating updates is generally frowned upon, that's when things can break. But waiting to run updates until you feel like it (instead of daily) is totally fine. I've been using Arch and its forks for years, and have always updated once a week unless something was wrong.
It started with someone who worked on set for The Apprentice. It was specifically fecal, and believed to be due to constant stimulant use.
EndeavourOS or raw Arch would both fit that bill, you don't need to run updates every day just because they're available. Manjaro delays packages to "increase stability", but that's what causes it to break.
You don't even need to purchase a domain, free dynDNS services (DuckDNS or similar) are good enough for Jellyfin and the like.