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I used an old NUC with ubuntu to do this, except the backup was performed by my server rather than software on the NUC, makes it with easier that way, imo. Auto start in bios and Wireshark set to always connect.
I do recommend a wired connected if possible. So if someone messes with the wifi it won’t matter.
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And you do not have 7TB HDDs in it. Recheck that.