How long would the tape from an audio (compact) cassette need to be, to hold 580TB? How thick would that tape need to be to allow the motorized spool to pull t

How long would the tape from an audio (compact) cassette need to be, to hold 580TB? How thick would that tape need to be to allow the motorized spool to pull the tape from the other (passive) spool? Imagine you were to make an assembly that could hold two spools of this tape, how large would it be? It might be hard to fit it through the door of your server room. And it might not even fit in the van that carries away your off-site backups :)