this post was submitted on 10 Mar 2025
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Magnetic tape. It's one of the better long-term offline backup solutions. It is compact, inexpensive, has no moving parts (bearings, motors, reader heads), no scratchable surfaces, and can last for decades in a moderately climate-controlled room.
Just keep it away from magnets... or iron vaults. According to an anecdote (that I can't find right now), a large bank vault was repurposed as an offsite backup storage, except it kept wiping the magnetic tapes because the thick iron walls reacted to changes in the geomagnetic field.
Correlary: always test your backups and don't just assume that they will work when you need them.
If you aren't testing your backups then you don't have backups.