Hi,

following up on the previous discussion, below is a feature request form.

http://www.mail-archive.com/bacula-devel AT lists.sourceforge DOT 
net/msg04962.html

Any comments welcome,

Gavin

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Item n:   Implement a Migration job type that will create a reverse
          incremental (or decremental) backup from two existing full backups.
  Date:   05 October 2009
  Origin: Griffith College Dublin.  Some sponsorship available.
          Contact: Gavin McCullagh <gavin.mccullagh AT gcd DOT ie>
  Status: 

  What:   The ability to take two full backup jobs and derive a reverse
          incremental backup from them.  The older full backup data may then
          be discarded.

  Why:    Long-term backups based on keeping full backups can be expensive in
          media.  In many cases (eg a NAS), as the client accumulates files
          over months and years, the same file will be duplicated unchanged,
          across many media and datasets.  Eg, Less than 10% (and
          shrinking) of our monthly full mail server backup is new files,
          the other 90% is also in the previous full backup.
          Regularly converting the oldest full backup into a reverse
          incremental backup allows the admin to keep access to old backup
          jobs, but remove all of the duplicated files, freeing up media.

  Notes:  This feature was previously discussed on the bacula-devel list
          here: http://www.mail-archive.com/bacula-devel AT lists.sourceforge 
DOT net/msg04962.html
 
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