Nightly backup using CD-ROM - how do i?

[ANISH MISTRY]

----- Original Message -----
From: Odhiambo Washington <wash at wananchi.com>
Date: Monday, November 22, 2004 10:26 am
Subject: Re: Nightly backup using CD-ROM - how do i?

> * Anish Mistry <mistry.7 at osu.edu> [20041111 21:10]: wrote:
> > On Thursday 11 November 2004 11:45 am, you wrote:
> > > * Anish Mistry <mistry.7 at osu.edu> [20041110 03:21]: wrote:
> > >
> > > [snip]
> > >
> > > Hey Anish,
> > >
> > > Thank you so much for your script.
> > >
> > > I am not quite a newbie on Unix, but your script has gotten me 
> lost,> > such that I feel like a newbie ;)
> > >
> > > Could you kindly explain to me, step-by-step, how it works, 
> please?> >
> > > > #!/bin/sh
> > > > # the date
> > > > DATESTRING=`date +"%Y%m%d"`
> > > > BACKUP_DIR=/usr/local/var/backup
> > > > CD_DEVICE=/dev/acd0c
> > > >
> > Defining the date of the backups to copy, it assumes the 
> current.  Set the 
> > directory where the already tar'ed files are locations, and also 
> set the 
> > CDROM device.
> 
> Now that is where I have another question: I did not see when you
> created any files in $BACKUP_DIR/
> Did you use another script to create the files?

Yes.

> 
> [snip]
> 
> > > > cd $BACKUP_DIR
> > > > # get previous multisession info
> > > > MSINFO=`/usr/sbin/burncd -f $CD_DEVICE msinfo`
> > > > if [ "$MSINFO" != "" ]
> > > > then
> > > > MULTISESSION="-C $MSINFO -M $CD_DEVICE"
> > > > else
> > > > echo "First session."
> > > > fi
> > Here we probe the CD to get the last session's track info. If 
> there is not 
> > last session info, then that means that it's a blank cd so we 
> don't add 
> > the multisession info to the mkisofs command.
> 
> So you re-use the CDs sometimes? Does that mean your backups do not
> actually fill a CD? I suppose you are not backing up a whole system
> anyway.
> 
> All else is now clear to me.
> 
> Thank you again in advance.
> 
> 
> 
> -Wash
> 
> http://www.netmeister.org/news/learn2quote.html
> 
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--
Anish Mistry