Prepare for an Emergency
You probably carry a spare tire and a jack in your car (perhaps along with the phone number for roadside service). These sorts of basic problem-solving tools are just common sense. If you don’t have comparable tools for your Mac, you’ll be in a pickle if a problem occurs. Don’t get stranded without the means to get back up and running again.
All the items mentioned in this chapter can come in handy when a problem occurs. You might not use them all, but I’ve used each of them at one time or another, and I’ve found them all to be sound investments.
Acquire a Secondary Startup Volume
You can’t replace your car’s oil filter while the engine is running; it not only would be messy but could potentially ruin the engine. Similarly, ...