I think it depends on what you want to do, a setup like that probably won’t have a ton of throughput, so if you want to do a lot of high speed access it may not great. If you want to copy a backup or Linux iso to I periodically it would work.
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A raspberry pi 4 won’t be worth it for this. It would be a much better idea to find an older desktop with an intel cpu
I have one lying around, it's about how stupid of an idea this, is performance, mantainability, etc
No.