My backups are tiered. Some stuff gets no backup at all, some gets even more than 3.And I tend to reuse HDDs that got replaced in my main machine due to size for my backups. Power consumption hardly matters when it only runs for a few minutes a day.
It is impossible to fully eliminate the risk but with a decent backup system in place it is somewhat unlikely to lose all of your data.
The 321rule should be used as a baseline. Your local backup should be snapshotted and somewhat hardened against ransomware (pull backups instead of pushing them, do not mount the backup volume to other machines). Cold backups also help.
Can I construct scenarios in which I lose all my stuff? Sure. But in those, we are either in deep shit anyway (CME, some big astroid) or it is pretty unlikely (targeted hacking)
Archiving modern websites is rather tricky. There are tons of servers involved and they often run some software themself. These are black boxes that cannot be archived without direct help from the web admins. For this reason, archived sites are often broken in some minor or major way.
Without a link, it is pretty hard to help you with your specific problem.
Every drive can fail at any moment. Even a brand new one. It is just a bit less likely than having a decade old drive fail.
If you care about your data make sure you have backups. 321rule.
Yes, you can use a “NAS” drive pretty much like any normal drive. This is an SMR drive so not even a NAS drive to begin with.
If you do not have backups pay a professional to recover it. Yes, this is wildly expensive but tinkering yourself can make recovery even more expensive or outright impossible.