datahoarder
Who are we?
We are digital librarians. Among us are represented the various reasons to keep data -- legal requirements, competitive requirements, uncertainty of permanence of cloud services, distaste for transmitting your data externally (e.g. government or corporate espionage), cultural and familial archivists, internet collapse preppers, and people who do it themselves so they're sure it's done right. Everyone has their reasons for curating the data they have decided to keep (either forever or For A Damn Long Time). Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures.
We are one. We are legion. And we're trying really hard not to forget.
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It would be marginally risky, but considering how many people have large storage arrays having a “mutual backup compact” between two folks where each can run backups to the others array would help get you an affordable offsite backup for catastrophes.
I see a bunch of people with 10TB of data and 30TB arrays and if two of them got together they would both be reasonably safe from a total array failure.