> /var/lib/mysql/bacula totals 34 MB, this contains the various 
> FileName/Job/JobMedia/Pool MYI/MYD files, which is I presume the actual 
> database, and the sizes I would expect.
>
> The Vol_Catalog file defined in my config is a single file of by now ~4 GB 
> (stored on Samba mounted NAS share).
>
Okay. Now I understand what you are talking about. You are backing up
the catalog to a file volume named Vol_Catalog.

>
> The 11 MB is the size I get when I do a mysqldump (presumably from the 
> database from /var/lib/mysql/bacula/*), and also happens to be the delta by 
> which the size of the Vol_Catalog file is increasing every day.
>
> So it looks like the daily database is dumped to the catalog and never purged?
>
>
If you do not limit the size of this volume or the use duration it
will never purge. Since bacula will only purge a volume that is marked
Used or Full. This is the same with any volume in bacula.

See here for more info:
http://bacula.org/en/rel-manual/Automatic_Volume_Recycling.html#14746

And for my volume that contains the catalogs I limit the size of the
volume to 2GB and I have a 30 day retention period so I have a few
volumes that are in use. My catalog dump after compression is 1.7GB.
For me this is no problem because I have allocated 200GB of raid 6 for
just file volumes for bacula and the only thing I use them for at the
moment is catalogs and cvs the other 17+ TB of data I have mostly
backed it up is on LTO2 tape with my 2 drive 24 slot autochanger.

John

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