Automatically Backup a Mac · Sep 29, 09:26 AM

You don’t need any software like Carbon Copy Cloner or a disk duplicator. You have everything you need with rsync.

  1. Get an external drive
  2. Plug it in, format it, erase it, give it a volume name (‘Backup’ makes sense).
  3. run sudo rsync -vaxE / /Volumes/Backup/
  4. Now your whole drive is backed up on the external drive. To automate this, put it into root’s crontab:
    1. sudo su
    2. crontab -e
    3. Add a line: 0 1 * * * sudo rsync -vaxE / /Volumes/Backup/
    4. quit the editor

It will run rsync at 1am every day.

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