It appears that this bug is caused by poor error checking and handling in simple-backup-config. In order to fix this bug, it would be useful to know what's in /etc/cron.d/sbackup .
Please post output from
$ cat /etc/cron.d/sbackup
** Changed in: sbackup (Ubuntu)
Status: Unconfirmed => Needs Info
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No open /usr/sbin/simple-backup-config, post run
https://launchpad.net/bugs/5720
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