>>>>> 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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