backup system before upgrade

[Default User]

Hello.

What is the best way to do a full system backup of Ubuntu 11.4, in
preparation for upgrading to Ubuntu 11.10?  11.4 is just a single partition
(plus a swap partition, of course).  I want to back the main partition up to
another partition on the same hard drive.

One way would be to boot the 11.10 live cd and then use the DD utility from
there, but wouldn't a single disk error mean the backup is useless?

Is there a better way?  What are others doing to backup prior to upgrading?
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