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1 year ago$2000 - 45 Drives HL15 case, motherboard, etc
$2000 - 6x22 TB WD Red (or whatever size you can get after black friday)
$1000 - 5x4 TB SATA SSD of your choosing
132 TB of HDD storage (raw) + 20TB of SSD storage (raw) delivered over SFP or 10GBe
I don’t know that I’d take on tape with your use case. There’s a good bit of tech debt involved there.
NAS (either bought or built) + Amazon glacier or Backblaze for cloud archival backup.
The NAS (including drives) will probably cost you $7000-8000 USD for 400ish TB of storage with room to grow
It was easy to give clients access to old data directly if they needed, etc.
I hope you charge for this. It would help to offset your storage costs.