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The author explicitly mentioned syncing to his parents house. Even the "RAID is not backup" should be more nuanced IMO once you are talking about FS that supports regular snapshots.

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RAID is not backup. Snapshots on same storage are not backup. For “the oh I don’t like this edit of my Word doc, do I have a version from yesterday”, sure, snapshots. For momma giving birth photos, you need backup. S3 is $1/tb for backup. Blu-rays are metal not ink now, discs are $2/25gb which might work for older photos. LTO6 drives can be had for under $1000.

> i want to keep my data for my entire life.

NAS has very little part in this conversation. In this conversation, a NAS is the same category a desktop drive: it is better than a laptop that you can lose.

the reason RAID is not backup, aside from snapshotting, is colocated drives (same faulty machine, same flammable location, same malicious thunderhead) have a far higher chance of failing at the same time due to evnironmental effects --- hence the decision to have half the drives stored remotely. having a third copy, stored cold (blu-rays are a good idea) helps, but only if its failure is sufficiently independent af the others to make a real dent in the probabilities (e.g., a safe-deposit box or a friend's house, not where any of the drives are!)

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