[jaw]

I replied to a similar point about hashing here - https://news.ycombinator.com/item?id=23032633

You're correct that the methods I described are a far cry from actually guaranteeing that the backup has no errors. In the same way that a unit test doesn't prove code is error-free, but _can_ justify increased confidence in the code, I'm interested in techniques that can justify increased confidence in my backups. Particularly in cases where I don't have direct access to the original data, and where exhaustively checking the data manually is too time-consuming to be worth it.