Re: [Bacula-devel] suggestion regarding how FileSet changes affect forced "full" backups

[Jason A. K. <ja...@ka...>]

You can disable the upgrade to full...

http://www.bacula.org/en/dev-manual/main/main/Configuring_Director.html
Ignore FileSet Changes = yesno

				-Jason

On Thu, 2011-12-29 at 12:18 -0500, sta...@bi... wrote:
> Hello,
> 
> I am a first-time user setting up Bacula 5.0.3.
> So far Bacula is outstanding and brilliant in
> every regard, but I've come across a point where
> perhaps a useful adjustment could be made.
> 
> The backup server under construction will take
> full backups every six months with an age-out
> after 18 months.  It's for a set of ten
> development systems, and I'm trying to mimic my
> manual approach of taking rare snapshots and then
> tracking file changes during the intervals.
> Configuring no differentials, just daily
> incrementals.  Want everything to fit on a
> mirrored pair of 3TB disks where a third drive
> will occasionally be swapped for a mirror leg and
> rotated off-site.
> 
> I've hit a snag, which is that if the FileSet list
> is modified, a full backup is forced.  This will
> eat significant disk space in the envisioned
> setup.  Since its running in "Accurate" mode, it
> seems to me that there is no need to force a full
> backup when the FileSet is changed.  Correct me if
> I'm wrong, but Accurate backup mode operates
> essentially as a set subtraction operation from
> the set of all previous incremental and
> differential backups back to the last full backup
> and the current set of files.  So if for example,
> the FileSet is tweaked by adding an exception for
> a new directory, the difference in the before and
> after sets is minor and Accurate mode should have
> no trouble maintaining continuity through the
> change.  Even if one made a radical FileSet
> modification, it would still work and I can see
> how allowing this could a useful as well.
> 
> The forced-to-full backup condition makes perfect
> sense when Accurate backup mode is disabled, so my
> suggestion is to allow FileSet changes to not
> force a full backup only when Accurate mode is
> present in entire the backup set for a target
> system.
> 
> Hope this idea makes sense and is deemed worthy of
> attention.
> 
> Thank you for the wonderful software.
> 
> Regards
> 
> 
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Jason A. Kates (ja...@ka...) 
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