Part of the reason why I'm sometimes a little bit joking about EMP is because let's face it, it mean you've lost power at the same time your car has died. For the first day or two, basic preps will be fine so long as no riots break out and any disruption of services in a urbanized area brings that risk, so those of us who would dig in rather than bug out in the face of hurricane or after an earthquake already know this drill.

After that, the reality will sink in and honestly unless you are in a position to influence the behaviors of large numbers of people, then you're just going to have to roll with it. If it is very wide spread, you aren't getting external support and resupply, so you are suddenly going to have to worry about something worse than having to replace my computer- the 90% of people who are hungry and unprepared.

Also, while everyone talks about EMP, they ignore than in most scenarios, EMP is part of decapitation before a strike with either conventional or nuclear explosives. The former is called "war", the latter has problems a lot bigger than my electronic banking records are gone, both of those being things that the average citizen is not really able to do much about that other than to hope that our elected representatives and their career advisors (a) aren't fallout and (b) don't choke.

If you loose your harddrive, anything you didn't back up is gone- if it is important, put it on hardcopy, if it's kinda important but not critical, put it on CDs and DVDs. That's just computercraft. Have a backup plan for mobility, getting water, keeping food, staying warm, and making light. And be ready for normally average-to-smart people in a large group to do something amazingly stupid. How does EMP honestly differ from any other major problem such as a hurricane, earthquake, epidemic or an expeditionary and colonial fleet from a non-Terrestrial nation, other than outside support might not be there ever if the effects are widespread, rather than in a few days to a week? How do you plan for that, other than to gather the tools you think you'll need and be ready to adapt?