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No, it guarantees a physical backup not connected to any system. Tape is very reliable.

"Never underestimate the bandwidth of a station wagon full of tapes hurtling down the highway." -- Andrew S. Tanenbaum

Depending on the amount of data and time of travel etc, it might be more economical/reliable to do this than do it over the wire.

private couriers aren't a thing? surely it must be cheaper than paying $200 for plane tickets every day.