Actually, the tape backups are basically for offsite
backups of online disk backups. I actually have two
disks that I am trying to backup in this fashion,
one is the database backups that I mentioned in the
previous mail and the other one is a disk containing
all my "online" amanda backups done with the "file:"
driver. I have a weeks worth of backups on the disk
(as 7 virtual tapes) and I want only the latest tape
dumped to the offsite tape nightly.
So I will really only be going to these tapes for
either:
a) complete disaster;
b) a historic backup (>1 week);
c) crash of one of my "online" backup disks.
Cheers,
Milos
----- Original Message -----
From: Bernhard Beck <bb AT collabrys DOT com>
Date: Tuesday, March 18, 2003 3:17 pm
Subject: RE: differential vs incremental backups
> Of course this would all be done with scripts from
cron jobs.
> Agree on the
> restore part. However, I would never restore
critical data like
> this right
> into production anyway.
>
> Milos, if your intention is to avoid going back to
tape for
> restores when
> under time pressure to get your database working
again, maybe the
> AmandaFILE: driver is something to consider.
>
> Bernhard
>
> > -----Original Message-----
> > From: Thomas Hu [mailto:thomash AT date DOT com]
> > Sent: Tuesday, March 18, 2003 12:09 PM
> > To: 'Bernhard Beck'; mbrkic AT farelogix DOT com;
amanda-users AT amanda DOT org
> > Subject: RE: differential vs incremental backups
> >
> >
> > Dereferencing the symlinks is up to tar or gtar
and I believe
> can be
> > specified within amanda configuration. However,
extra caution
> has to be
> > taken in recovering as by default the link would
be disconnected and
> > filled in with actual data. Two issues can merge
up. One is the disk
> > space of filesystem where the links are. The
other is you still need
> > manually copy the data to where it is supposed
to be.
> >
> > For production env, got to have a better way.
Carefully
> organizing the
> > filesystem/directory architecture and a few cron
job lines would
> work.> Or simple incremental backup of the whole
filesystem would
> work too.
> >
> > Thomas
> >
> >
> >
> >
> >
> > -----Original Message-----
> > From: owner-amanda-users AT amanda DOT org
> > [mailto:owner-amanda-users AT amanda DOT org] On Behalf
Of Bernhard Beck
> > Sent: Tuesday, March 18, 2003 2:19 PM
> > To: mbrkic AT farelogix DOT com; amanda-users AT amanda DOT org
> > Subject: RE: differential vs incremental backups
> >
> > I'm looking at a similar problem here. One of
the ideas we came
> up with
> > was
> > to create a current directory (e.g.
/dbdumps/current) which gets
> backed> up
> > by Amanda. Inside are symlinks to the actual
dump files in the daily
> > directories (/dbdumps/01, /dbdumps/02, ...).
Your daily DB dump
> script> updates the symlinks in current when it is
done.
> >
> > We haven't implemented this yet, but Amanda
should dereference the
> > symlinks
> > and back up the right data. This way you always
access the same
> DLE and
> > get
> > your normal Amanda behaviour.
> >
> > In your case, depending on what your dumps look
like, you could
> run diff
> > on
> > today's and yesterday's dump and only back up
the result
> (Amanda always
> > backs up whole files).
> > In our environment this doesn't really matter
though, since the dump
> > files
> > are changing pretty dramatically at times, so an
incremental
> would look
> > like
> > a level 0 anyway most of the time.
> >
> > Personally, I'd feel safer with just backing up
the whole dump
> every day
> > and
> > leave the job to Amanda.
> >
> > Your milage may vary of course.
> >
> > Bernhard
> >
> > > -----Original Message-----
> > > From: owner-amanda-users AT amanda DOT org
> > > [mailto:owner-amanda-users AT amanda DOT org]On Behalf Of
> > mbrkic AT farelogix DOT com
> > > Sent: Tuesday, March 18, 2003 9:14 AM
> > > To: amanda-users AT amanda DOT org
> > > Subject: differential vs incremental backups
> > >
> > >
> > > Hi,
> > > I have a disk that is a cache for database backups
> > > and is a set of 30 directories with database
exports
> > > of the last 30 days. I want to use Amanda to
backup
> > > ONLY the latest written directory every night,
> > > without ever doing a full backup of the whole disk
> > > (it is too big
> > > to fit on one tape! :( )
> > >
> > > In other words, is there a way to tell Amanda to
> > > always back-up only the changes from the last run
> > > regardless of dump levels. Equivalently, is
there a way
> > > to fool Amanda into thinking that a full
backup was
> > > done every night, after the level 1 completes
> > > successfully.
> > >
> > > Any other ideas would be appreciated!
> > >
> > > Cheers,
> > > Milos
> > >
> > >
> > >
> >
> >
>
>
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