Imagine the worst. Losing irreplaceable photos because your Mac’s drive failed? Accidentally deleting your dissertation? You might think it will never happen to you, but all it takes is a glass of water falling onto your MacBook and you could lose everything.
But at least if you’ve got a backup, the financial outlay of getting a new Mac will be made less traumatic by the fact that you can recover everything from your old one. Luckily Apple makes backing up your Mac really easy, so there really is no excuse not to do it.
Read more at Macworld.com