Hot take: For personal use, I see no value at all in "availability," only data preservation. If a drive fails catastrophically and I lose a day waiting for a restore from backups, no one is going to fire me. No one is going to be held up in their job. It's not enterprise.
However, redundancy doesn't save you when a file is deleted, corrupted, ransom-wared or whatever. Your raid mirror will just copy the problem instantly. Snapshots and 3,2,1 backups are what are important to me because when personal data is lost, it's lost forever.
I really do think a lot of hobbyists need to focus less on highly available redundancy and more on real backups. Both time and money are better spent on that.
