How to protect data from radiation and strong magnetic field?

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oem7110
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I keep my files using HDD, can my files still be retrieved under radiation and strong magnetic field?

Will it be better if I copy them into DVD disks?

Does anyone have any suggestions?
Thanks in advance for any suggestions
 
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Strong magnetic fields at the disk can erase the data - DVDs are better, as they do not rely on magnetization.
Radiation: Probably depends on the type of radiation.

If you expect significant radiation or strong magnetic fields somewhere (why?), what about an external backup?
 

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