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<td class="h1"> Backups on CD
<br>
Chapter 1 Overview</td>
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<h2><a name="s-usage">1.1 Usage</a></h2>
<p>Just type <code>backuponcd -s (directory) -e (excludelist)</code>, where <code>(directory)</code> is the full path to the directory which you want to archive and <code>(excludelist)</code> is a grep-script.</p>
<p>The output of <code>backuponcd -h</code> is:</p>
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-s directory which is to archived
-e excludelist may be a empty file, usually a list of mountpoints,
view example in /etc/backuponcd/excludelist
-a archiver (optional) overrides your setting (archiver=..)
in /etc/backuponcd/global.rc
-rc global settings (optional).
Overrides built in parameter "-rc /etc/backuponcd/global.rc".
Must be full path to rc file.
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<p>If you want to generate a backup on a running system, some folders must be excluded, have a look on an example exclude list (see <a href="ch-settings.html#s-excludelist"><code>/usr/doc/backuponcd/samples/excludelist</code>, Section 4.1</a>).</p>
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<h2><a name="s-whatdoesit">1.2 What does it do?</a></h2>
<p>The script generates a backup providing tar or afio relative to <code>(directory)</code> and stores it temporary in the backuppath, depending on your settings in <a href="ch-settings.html#s-global.rc"><code>/etc/backuponcd/global.rc</code>, Section 4.2</a>. The archive can have any length, it is splitted into smaller pieces and burned while the backup runs continuous.</p>
<p>This is done by using pipes and burning multisession CDs, so don't worry if the gzipped tarball of your system amounts 1.5 + Gbyte. In this case you need 3 CDs with a media cost of 6$ if you use CD-RW.</p>
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<h2><a name="s-howitworks">1.3 How does it work?</a></h2>
<p>Extracting an archive looks like this:</p>
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cat /cdwriter/tar.gz.* | tar --compare --gzip --file=- | \
tee -a /tmp/logfile
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<p>while the filenames of the archive are <code>tar.gz.00</code>, <code>tar.gz.01</code> and so on.</p>
<p>A bit more complicated is reading a multisession backup:</p>
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# /usr/doc/backuponcd/samples/simple_read
# a very simple example how to read an archive stored on
# several CDs. Must be killed by typing ^C if reading is
# finished.
device="0,3,0"
rawdevice=/dev/cdrom
mountpt=/cdrom
while true; do
cdrecord dev=$device -eject > /dev/null 2>&1
echo -e "\a\n Please insert the (next) volume" > /dev/tty
read ans
mount -t iso9660 -o ro,noexec $rawdevice $mountpt
if test $? -eq 0; then
echo "Now reading the volume..." > /dev/tty
cat /cdrom/*gz*
else
echo -e "\a\n Mount failed." > /dev/tty
fi
umount $mountpt
done 2> /dev/tty < /dev/tty
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<p>The script is used as follows:</p>
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<pre>
~/bin/simple_read | tar --compare --gzip --file=- | \
tee -a /tmp/logfile
</pre>
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<p>BackupOnCd comes with longer shell scripts which recognize multi- and singlesession CD and type out better comments, know which volume is inserted and so on.</p>
<p>If you assume that burning does work similar you're right, it does (see <a href="ch-details.html">Details, Chapter 3</a> if you are interested).</p>
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Backups on CD
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<address>
17 April 2000
<br>
Holger Nassenstein <code><a href="mailto:backups@tuxoncd.de">backups@tuxoncd.de</a></code>
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