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
>
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