How about high-density magnetic tape cartridges? They're pretty popular in enterprise for offline storage https://www.ibm.com/products/3592-tape-cartridge http

How about high-density magnetic tape cartridges? They're pretty popular in enterprise for offline storage https://www.ibm.com/products/3592-tape-cartridge https://www.ibm.com/products/3592-tape-cartridge https://www.ibm.com/docs/en/ts11xx-tape-drive?topic=STPRH6/com.ibm.storage.drives.doc/con_3592ipg_cartridge_types_characteristics_3592.htm https://www.ibm.com/docs/en/ts11xx-tape-drive?topic=STPRH6/c...