On Wednesday 22 March 2006 04:53, John Goerzen wrote:
> On Tue, Mar 21, 2006 at 11:29:08PM +0100, Kern Sibbald wrote:
> > Hello,
> >
> > I'll let "real users" such as Michel Meyers and others answer most of the
> > questions for you, but I thought I'd throw in a few minor comments.
>
> Hi Kern,
>
> Thanks for taking the time to reply personally and for all your work on
> Bacula.
>
> Also, I've got to say that we've all decided that Bacula has the best
> slogan of any backup program we've ever seen ;-)
>
> > Unless I am mistaken, Amanda mostly uses certain Unix programs like tar
> > for backing up and restoring data. If that is the case, then it (Amanda)
> > suffers from exactly the same problem -- in fact a large number of
> > problems such as Bacula base backups on the date/time stamps, which is
> > the origin of the problem.
>
> I have only ever used Amanda with the tar backend (never dump), so I can
> only speak to that. Amanda's tar backend works exclusively with, and
> requires, GNU tar. Amanda uses GNU tar's listed incremental mode. See
> http://www.gnu.org/software/tar/manual/html_node/Incremental-Dumps.html
> for details.
>
> In short, tar notes every file's name, inode number, and [cm]time in a
> separate file when performing the full backup. When performing
> incremental backups, it compares the state of the filesystem to the
> recorded state and does what it needs to to update the state.
>
> It also puts a list of all files in each backed up directory into the
> archive with every operation. When extracting an incremental archive,
> when using -G (which amanda can), tar will actually delete files from
> the host filesystem that weren't present at the time of the backup.
>
> So, this solves both the problem of leaving deleted files around and the
> problem of not noticing renamed/moved files. Since Bacula appears to
> already have essentially that information in its Catalog, it seems that
> it already has the tools to accomplish the same thing.
Thanks for filling me in on the ins and outs of GNU tar. Hopefully, the
Bacula project to resolve these problems will pop to the top of the list of
the list soon -- it is project #3 the highest priority project that is not
yet started (#1 is essentially complete, and #2 is about 50-80% complete).
>
> > > Reading about how the author's test network is
> > > using token ring,
> >
> > I don't know where this quote came from, but I don't have a token ring,
> > and I have never had one.
>
> I was sure I saw that in rel-bacula.pdf, but on looking now, I can't
> find it. Must have been mistaken. Sorry about that.
>
> Thanks,
>
> -- John
--
Best regards,
Kern
(">
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