Re: [Bacula-users] too big differential backup

Zsolt Kozak wrote:
> Hi there,
> 
> I have a working Bacula-system, my only problem is that I get too big
> differential backups comparing to the full backup, although just a few
> files changed. (I had the same issue when I used incremental backups
> before but now I'm using only full and differential backups.)
> 
> I just backed up a directory with almost 130 000 files and got a 6GB
> full backup. Then I run a differential backup and got 70 000 files
> backed up again using 2GB disk... The differential backup has just run a
> few minutes after the full finished and the files did NOT changed since
> the full backup finished. I checked the version browser in Bat and found
> duplicated files with having the same hash and after checking the files
> on the file-system, I noticed that they were not changed at all.... The
> same size, permissions and modification date.

Bacula has tracing facilities that might let you figure out why it's
selecting these files for backup.

Maybe someone who's done a bit more with the guts of bacula can advise
you on a good way to trace this and find out more. Then turn on tracing
using the "setDebug" command in the console, run your differential, and
start wading though the (huge) amount of output.

See "setdebug" and "trace" in:

http://www.bacula.org/5.0.x-manuals/en/console/console/Bacula_Console.html#SECTION00250000000000000000

under the alphabetical list of console commands.

--
Craig Ringer

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