Whether you’re backing up your Mac with Time Machine or another service, it can be an incredibly time-consuming process. Over at How-To Geek, they walk through a number of the folders you can probably skip if you need to get that backup done quickly.
Time Machine is the built-in service in Mac OS X that makes backups super-easy, and Apple’s Time Capsule makes the whole process even easier. Unfortunately, Apple’s official hard drive solution is a bit pricey at $349. Raymii shows how to build one with a Raspberry Pi.