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dd is the basic Linux low-level copy utility--it is included in any Linux I have ever seen. If you need it to copy the drive in the system, you can use it from a live CD.
Be aware that--if you clone a 20GB drive to a 40GB, you will wind up with the first 20 matching the source, and the last 20 unusable. This is, however, fixable by changing partition tables. Not a problem if you are just cloning for backup or transfer purposes.
The instructions are for Ubuntu, but if you go to the Sbackup sourceforge page, you can get generic installation instructions. Sbackup is supposed to be an easier alternative to rsync + cron for backing up and restoring a system. For backups, you normally just need your data and some configuration files, not the whole hard drive.
dd is a low level utility that makes a bit-for-bit copy of a drive, directory, or partition. It does not have the flexibility of Norton Ghost to restore individual files.
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