Here in the land of volcanoes, earthquakes and oceans (the US Pacific Northwest), *some* of us keep stores of water (>90gal here) and food among other things, (like candles, gas masks, duct tape & tea). Camping supplies are obvious and plentiful (stoves, gas, backcountry water purification pumps, first aid, etc); the key items are in a durable bin I can throw in the car in a moments notice. And documents are kept in a fireproof box. Plus I have 2 options for creating a temporary latrine, should our sewage systems get knocked out (& plenty of TP/bogrolls too). My office has earthquake kits and some supplies as well.
I don't worry about data; if my laptop & backups survive, awesome. If not, I'll miss all that por-- I mean: all those replaceable photos.
However, I have a solar battery charger for AA & AAA batteries (for the radio, flashlights,etc.), and a small "Solio" brand solar charger that can charge cell phones and other small electronics. Also a handheld LED flood light that can recharge from the cigarette lighter in the car, and which can also charge small electronics.
Walkie-talkies for local coordination, if that becomes necessary (otherwise: great for road trips!)
And while I know several of my neighbors, but more importantly I have a network of nearby, trustworthy & very reliable people with all sorts of builder, tech, medical and theater skills, and I know exactly where they live.
Good tips to keep your vehicle's gas topped up, and important docs on a USB drive on your keychain... smart, that.