Martin,
Thank you for checking my logic. I wonder if it would be worthwhile to the
Bacula community to have some simple diagrams that accompany the User's
Guide, such a diagram that shows a timeline and how Bacula Jobs operate
along such a timeline? I'd be pleased contribute some graphics to the
documentation if that's something other people would also be interested in.
Cheers,
-H
On 9/17/07, Martin Simmons <[EMAIL PROTECTED]> wrote:
>
> >>>>> On Sun, 16 Sep 2007 20:21:21 -1000, Hydro Meteor said:
> >
> > Hello all,
> >
> > I am trying to ensure I have a strict understanding of the Bacula User's
> > Guide with respect to how Differential and Incremental Backups work, but
> I
> > would like to take an example to see if I have worked through my logic
> > correctly ...
> >
> > Lets say I have this FileSet definition which is fixed throughout the
> > example herein:
> >
> > # List of files to be backed up
> > > FileSet {
> > > Name = "Full Set"
> > > Include {
> > > Options {
> > > signature = MD5
> > > }
> > > File = /Users/admini/bacula-2.2.3
> > > }
> > > Exclude {
> > > File = /proc
> > > File = /tmp
> > > File = /.journal
> > > File = /.fsck
> > > }
> > > }
> > >
> >
> > Assuming this FileSet definition does not change. I then:
> >
> > 1. Make the first Full backup of the Included File (which is a directory
> > named /Users/admini/bacula-2.2.3)
> >
> > 2. After a period of time, let's say that one file underneath the the
> > directory /Users/admini/bacula-2.2.3 is modified, such as:
> >
> > /Users/admini/bacula-2.2.3/A
> >
> > 3. After the modification, I ask Bacula to make an Incremental backup to
> a
> > Volume labeled INC1 which only contains this single change:
> >
> > /Users/admini/bacula-2.2.3/A
> >
> > 4. After the Incremental backup, another file is in the Included
> directory
> > is changed:
> >
> > /Users/admini/bacula-2.2.3/B
> >
> > 5. After this change, I perform a Differential backup. The Volume
> created by
> > the Differential backup is labeled DIFF1 and contains only but both
> ("merge"
> > so-to-speak) these files:
> >
> > /Users/admini/bacula-2.2.3/A
> > /Users/admini/bacula-2.2.3/B
> >
> > 6. Ok, after the DIFF1 Volume was created, two files are changed (one of
> > which was previously changed and resides in the DIFF1 Volume) and a new
> file
> > is added:
> >
> > /Users/admini/bacula-2.2.3/A (2)
> > /Users/admini/bacula-2.2.3/C
> > /Users/admini/bacula-2.2.3/ADDEDFILE
> >
> > 7. After the files modified and added in step 6 above, I perform a
> second
> > Incremental backup to a different Volume named INC2. It is my
> understanding
> > from the Bacula User's Guide that this INC2 will only contain what has
> > changed since the time of the previous Differential, which will then be:
> >
> > The most recent version (second modification which I denote with "(2)" )
> of:
> >
> > /Users/admini/bacula-2.2.3/A (2)
> >
> > and the new modification to:
> >
> > /Users/admini/bacula-2.2.3/C
> >
> > and the file that was added:
> >
> > /Users/admini/bacula-2.2.3/ADDEDFILE
> >
> > ------------
> >
> > Is my analysis using the above examples and understanding of how Bacula
> > works correct? I wasn't totally clear on what happens if files are added
> to
> > an Included File where the Included File is itself a directory. It is
> clear
> > however that any files which are deleted remain in the Catalog until the
> > next Full backup volume is created.
>
> Yes, pretty much correct. The only problem is if ADDEDFILE has both its
> creation and modification dates older than the Differential backup. This
> won't usually happen on Unix, but can easily happen on Windows.
>
> __Martin
>
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