Chrome: Chromebooks are generally reliable, but problems do happen. Create a restore disk with the Chromebook Recovery Utility, so you can reinstall your operating system if anything ever goes wrong.
While modern PCs or Macs have a built-in recovery partition, many Chromebooks don't. If you install this utility on your Chromebook, it will detect your make and model. Then run the same utility on a Windows or Mac machine, and tell it the make and model of your Chromebook. Armed with a a 4 Gig flash drive or SD card, it will create recovery media for you, so you don't have to worry when everything goes kablooie.