[ArrogantBustard]

I have wondered if the electronics must be ‘on’ when the EMP happens. Does EMP destroy units that are turned ‘off’?

The electronics need not be "on". The destructive high voltage discharge would be induced by the EMP itself, not by the device's power supply. Shielded electronics might survive, depending on the shielding.

[JRandomFreeper]

For small stuff, I put it in MIL-B-81705-Rev-C bags, which go in surplus steel file cabinets that are grounded, and have been modified with copper finger-stock around the drawers.

With the Sun acting up, I'm more worried about another 1859 event than EMP from Iran. But whatever. It works either way. ;)

/johnny