Link: https://old.reddit.com/r/DataHoarder/comments/1tmn9rq/the_2_in_321_really_necessary/

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The original was posted on /r/datahoarder by /u/AnyKey19 on 2026-05-24 20:27:36+00:00.

Making 3 copies of data is easy. Having 1 offsite is easy. But I’m not sure about the 2 different formats thing. All my copies are on HDDs, because 26 TB on SSDs would be ludicrously expensive, and there aren’t a lot of other formats that are viable for storing that amount of data while being affordable, accessible, and not taking up a huge amount of physical space.

I do burn truly irreplaceable stuff like my personal photos to M-Disk BD-Rs and store them in a fireproof case as a last resort backup, but at 25 GB per disk that’s not really viable for an entire hoard of data. What exactly is the downside to using only HDDs for the vast majority of my collection? I guess if a massive magnetic storm came about and wiped every HDD, that would be a problem, but as the cliché goes, I think we’d have bigger things to worry about in that situation.