[Pete from Shawnee Mission]

https://briantomasik.com/backing-data-geomagnetic-storms-emps/

Back stuff up. This says that an unconnected memory stick should be OK in the event of an EMP.

I would still find a find a popcorn tin put some padding inside. Put your portable memory devices in it. Put the top on when not using them.

[metmom]

I’ve heard old microwaves will do, too.

Apparently whatever keeps the microwaves from leaking out, keeps stuff from getting in.