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If you do not have an OSX bootable USB drive you will need to make one from a healthy MAC: # cp -pr /Users/nestor/Library/Mail /extdrive/ # cp -pr /Users/nestor/Desktop /extdrive/ # cp -pr /Users/nestor/Pictures /extdrive/ # cp -pr /Users/nestor/Documents /extdrive/ # cp -pr /Users/nestor/Downloads /extdrive/

For examplehere are some directories I backed up today: Needless to say you need to be careful from now on. That is why we run the first command below. To mount the drive we need write permissions.In my case it is a MAC Hierarchical File System (HFS) In my case I had the internal drive, a USB stick and an external USB hard drive: Most likely it will be the last one listed. When the prompt appears connect the external USB drive.Restart in single mode (turn off, turn on and press "Command+S").How to proceed? The easiest way (for the geek ?) would be: You should not reinstall the OS before making sure you have a backup. Even when you keep daily backups your MAC might freeze at a time when the last important file has not been backed up.