Moritz StrohmUSB-Sticks and SSDs need power at some point to charge the tiny capacitors that make up flash memory cells. Otherwise data is lost. Magnetic drives can be damaged by strong magnets and if the drive electronics fail (by an EMP for example), it is difficult to retrieve the data.
In contrast, optical discs need to be protected from (sun)light and high temperatures. If one drive fails, the disc can be read on another drive.
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