>
> 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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