How strong of a magnet do you need to erase the data on an old-fashioned tape backup system (as in, one of those things that spins around with reels and tapes)?

How strong of a magnet do you need to erase the data on an old

Is there any technical reason tape backup is so expensive and out

Heritage, Free Full-Text

What is the best way to destroy magnetic tapes? - Quora

Ghosts In The Reels

Can damaged data be retrieved from Linear Tape-Open (LTO) backup

Magnetic Tape & Disk Data Storage - Vintage Computer Chip

A History of Removable Computer Storage

Tape, Hackaday