My important stuff goes like this: PiBox w/ Mirrored SSDs -> Server w/ RAIDZ2 (at another wing of the house) -> Windows NAS -> Backblaze Unlimited Multiple SS

My important stuff goes like this: PiBox w/ Mirrored SSDs -> Server w/ RAIDZ2 (at another wing of the house) -> Windows NAS -> Backblaze Unlimited Multiple SSDs and HDDs would have to go down at the same time, and there are hourly snapshots up to a month in case a roll back is needed. If you're relying on a third party in any case except total catastrophe, you're just waiting for that moment to come! This is why Backblaze is at the end, I depend on them when I have failed to provide availability myself.