HOW TO Make a clone
1 Choose the drive
To make a clone you’ll need an external drive with enough space to fit everything on your current Mac: a bootable clone has to be an exact replica of everything. Click Allow CCC to Erase “Drivename.”
2 Check your settings
Once you’ve set the options, you’ll see this screen with a summary of what’s going to happen: CCC is going to clone your Macintosh HD volume on your backup disk and it’ll make an exact copy of the source.
3 Start the cloning
Carbon Copy Cloner will take you step by step through some system preferences so it can do its job, and it’ll then begin to make your clone. This will take a long time if your external drive isn’t USB 3 or Thunderbolt.