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You could add more with a usb/thunderbolt/sas jbod expansion.
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Buy a bigger unit, transfer the drives and sell the old one
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Clustering/hyperconverged with truenas or ceph
Data Hoarder
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 (tm) ). Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures.
Some more info would be nice, like what size are the drives you’re using atm?
Twelve bays, each with 14TB. I don't need/use it for anything other than storage, really. A couple small-level docker things.
As you're already using large disks if I was in your situation I'd 100% get an expansion.