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For Option 1: press and hold the Command (⌘)-R keys until you see the Apple logo.

Also note that Both methods require that your Mac is connected to the Internet. You can also erase your data before installing Mac OS by selecting Disk Utility (see below). Use Option 2, if you are giving away your Mac. Option 2 (Mac Internet recovery mode) is to install OS X version that was originally installed on your Mac when you bought it new. Performing Option 1 will not cause any data loss. Option 1 (Mac Recovery mode) is to install the macOS version that was last installed on your Mac before you trying this process. Here is how you can do this: How to reinstall a new copy of Mac OS

You can also use disk utility (see below) to create a compressed back up of your files.

Time Machine (Apple menu > System Preferences > Time Machine).

To back up your computer, you may have the following options: !!It’s a very good idea to back up your files before attempting this because things can go wrong!! It is not a difficult process and it does not erase your data. You Mac does not work as well as it used to? Reinstalling Mac OS can be one of the easiest ways to fix problems on your Mac.