backing up shadow files with rsync?

[Patrick O'Callaghan]

On Wed, 2011-02-16 at 11:27 -0500, Genes MailLists wrote:
>   I would also suggest you use rdiff-backup and not rsync - that way
> you
> will have history of changes - and if the disaster is /etc/shadow got
> turned to 0 byte file - having  a backup of earlier versions is vital.
> rdiff-backup leaves you a browsable top level directory of files of
> the
> current snapshot - (just like a rsync backup would) but has the
> ability
> to build older revs too.

I'd just like to put in a word for rsnapshot, which has similar
properties.

poc