How do you back up your Mac locally and off-site or online so all your important photos and files stay safe and sound? Like this!
You absolutely have to back up your Mac. If you don’t, one day — maybe tomorrow, maybe next week or next year — you will lose something important and irreplaceable and there will be nothing future you can do but curse at and blame past you. I don’t say this to scare you. I say it to save you. Back up. Do it now. And do it like this.
Source: How to back up your Mac | iMore