On Thu, Aug 14, 2008 at 10:30:10AM -0400, Ryan Novosielski wrote:
> John Yates wrote:
> > Is there any way to get Bacula to expire backup jobs based on a count
> > of existing jobs of the same type rather than by how old each job of a
> > type is? I am currently running a job every night that backs up to
> > disk, and I want to keep the two most recent ones. If it set the
> > retention period to two days, that should ususall do the right thing,
> > but if, for example, I shut off all my computers and go on vacation
> > for a week, when I come back, my backups will all be expired -- not
> > what I want.
> >
> > I suspect that what many, if not most, people really want is to keep a
> > specific number of old backups, not any that are more recent than a
> > certain date. Is there some way to make bacula work this way? The
> > Storix backup product that I have used can do this.
>
> Are you speaking from experience with Bacula? Bacula is very reluctant
> to recycle any data, especially if there are no current backups. I see
> what you're getting at, but unless I'm missing something, that is not
> what actually happens, so I'm guessing this is hypothetical.
>
> There is no way without scripting to ask it to keep a certain number of
> backups, though with predictable scheduling, this will happen anyway.
> And if you're worried about throwing away current backups, I'm really
> not convinced that it has this problem.
>
> - --
> ---- _ _ _ _ ___ _ _ _
> |Y#| | | |\/| | \ |\ | | |Ryan Novosielski - Systems Programmer II
> |$&| |__| | | |__/ | \| _| |novosirj AT umdnj DOT edu - 973/972.0922
> (2-0922)
> \__/ Univ. of Med. and Dent.|IST/AST - NJMS Medical Science Bldg - C630
I should have mentioned some of my other concerns: I also want to
arrange to automatically delete the disk files that contain expired
(is this the correct terminology?) backups. I have set up volume
labeling to contain the job name and date, and it appears that when
bacula recycles a disk volume, it doesn't relabel it, so in order to
get the "correct" label, I need to delete old backup files rather than
recycle them.
Therefore, I am writing a script to look for expired disk backup files
and delete them. This makes expiring backups by count more
important. Also, at least for me, I seems the more natural way to
think about how to decide when to expire a backup.
John
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