I have the same problem as Francois... I will apply your suggestions and let
you know if it works for me...
2009/3/16 Kevin Keane <subscript...@kkeane.com>
> Yes, you are right. I was sloppy in how I phrased it. First of all, we
> are talking about volume retention here. Job retention does affect
> volume retention, but only indirectly.
>
> Second, you are right, technically speaking, the old backups aren't
> deleted. Instead, the same volume is reused. When you back up to a file
> on hard disk, what that means is that the file is truncated to length 0,
> and then used for the next backup. The effect is the same as deleting
> the file and recreating it: the data is lost and the space on the disk
> is freed up.
>
> This mechanism is called recycling. The way bacula recycles volumes is
> highly configurable, but the general idea (somewhat simplified) is this:
>
> - bacula purges jobs older than the retention period. This indeed only
> affects the database. You could still restore the files directly from
> the backup file.
> - bacula purges volumes when all the jobs on the volume have been
> purged, AND the volume is older than the volume retention period. This,
> too, only affects the database.
> - bacula recycles a purged volume. This will affect the actual data.
>
> Does that answer your question?
>
> Silvian Cretu wrote:
> > Hi to everybody !
> >
> > Kevin, you're saying that by reducing the retention times, old backups
> > are being deleted. But, according to the documentation, *Job
> > Retention* " affects only records in the catalog and not data in your
> > archive backup". See
> >
> http://www.bacula.org/en/rel-manual/Configuring_Director.html#ClientResource2
> >
> > So... how do you actually delete (from disk) the actual old data in
> > the backup ?
> >
> > 2009/2/11 Kevin Keane <subscript...@kkeane.com
> > <mailto:subscript...@kkeane.com>>
> >
> > First of all, depending on your situation, I find that a full backup
> > once a month, and weekly differentials, as you suggested, can be a
> > pretty good schedule.
> >
> > When you run out of backup space, ultimately the problem isn't the
> > schedule but interaction between schedule and retention times. If you
> > have, say, six month retention times for full backups, your proposed
> > change in the schedule will accomplish not all that much. You also
> > don't
> > mention whether you are backing up to hard disk files or to tape -
> but
> > since you mention "space" rather than "number of tapes" I'm assuming
> > hard disk.
> >
> > So what you would want to accomplish in the end is really to make
> sure
> > you keep only two full backups of each client (you could even try for
> > only a single backup, but at that point your data may not be quite
> > safe
> > any more, so I'd say, two is the minimum).
> >
> > Keep in mind that you will always need space for a third backup - the
> > one that is in progress or that has just completed.
> >
> > You can accomplish that in two ways:
> >
> > - stretch the schedule.
> > - reduce retention times.
> >
> > So for the full backups, you should pick a retention time that is a
> > little longer than twice the distance between backups (it has to be a
> > bit longer because the you want the backup to stay around until
> > *AFTER*
> > the next one has finished). If you do go for monthly backups, make
> the
> > retention time 65 days. I would use the same retention time for the
> > differentials, and maybe 15 days for the incrementals.
> >
> > After changing the retention times, you will need to restart the
> > director and then update your pools and all the volumes that already
> > exist in the pool. Otherwise, changes to retention times will only
> > affect future backups.
> >
> > Depending on your setup, you may also be able to add additional hard
> > disks. Do one set of backups on the first disk, then the next set
> onto
> > the second disk. That will keep your data much safer because you no
> > longer rely on just one disk to store your precious data, and it will
> > even allow you to take one disk off site - and at the same time, you
> > double your disk space.
> >
> > François Mehault wrote:
> > > Hi All
> > >
> > > I would like to know what the best to do is. Today, in my
> > company, backups are scheduled like this: Full every Sunday and
> > Incremental backups other days. But resources becomes fully, I
> > need to configure Bacula to take less space. But also I need to
> > preserve data safe. So I would like to schedule backups like this:
> > full backup on first Sunday of the month, differential every other
> > Sunday and incremental backups other days. Is it a good idea to
> > fix my problem? Have you some advice for me about my problem? My
> > Bacula is in version 2.0.3 (director, SD). I ask myself if I have
> > to upgrade also.
> > >
> > > Thanks
> > >
> > > Regards
> > >
> > > François
> > >
> >
> > --
> > Kevin Keane
> > Owner
> > The NetTech
> > Find the Uncommon: Expert Solutions for a Network You Never Have
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> > Silvian Cretu
> > -----------------
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> --
> Kevin Keane
> Owner
> The NetTech
> Find the Uncommon: Expert Solutions for a Network You Never Have to Think
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