Public bug reported:

The TarIncrArgs config parameter, which is defined as
$Conf{TarIncrArgs} = '--newer=$incrDate+ $fileList';
expands to --newer=2014-05-25 02:00:00 ..filelist..
resulting in tar trying to make sense of the meaningless argument 02:00:00. 
This of course is a critical flaw, causing all tar incremental backups to fail.
I am not sure where the 'best' fix is, but it seems that Tar.pm controls the 
format of the datestring, so it should be quoting the results.
diff Tar.pm Tar.pm.orig
119c119
<         incrDate  => "\"$incrDate\"",
---
>         incrDate  => $incrDate,

** Affects: backuppc (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1324706

Title:
  backuppc tar incremental mode fails bad --newer arg

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