I've been seeing a similar issue the past 2-3 days.
I'm running the most recent version of 10.8 (but have not installed the recent Java update) and SD. I've been up to date on 10.8 probably since the update came out, yet SD has only recently started acting odd.
I've rebooted with no change. I've not yet tried rebooting and manually running the backups yet. Two of the backups are partitions on the same drive, one is on a separate drive.
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