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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Build a NAS. If you've already got one, build a second one as backup. It's cheaper in the long run than most cloud storage solutions. Especially when you factor in the time it would take for a complete restore.
30 TB this makes much more sense to build a NAS vs use the cloud, but a very important point: the second NAS should not be in the same location (long term) as the first.