>I'm looking for something that can backup to CD or DVD and can
  >span them over more than one CD if needed.  Some of what I have will
  >require several CDs.  It would be nice if it would tar it or zip it but
  >it is not required.

I've been in the same boat the last week, and have investigated
a number of options, and seem to be settling on app-backup/dar.
It compresses; does incrementals; creates split archives of any
given size; can keep an online catalog of offline data; and can
even encrypt.

Sample run:

    dar -c /backups/root-$(date -I)-full         ! what to write
        -R /                                     ! what to dump (root)
        -M                                       ! don't span filesystems
        -s 700M                                  ! Write CD-size files?
        -y                                       ! compress...
        -Z '*.gz' -Z '*.tgz' -Z '*.zip'          !  ...but don't compress these
        -P usr -P tmp -P var/cache               ! Exclude these directories
        -D                                       !   (write them as empty dirs)

This assumes that /backups is a separate filesystem.  Many of
those default options can and should be put in /etc/darrc.

The above command will write /backups/root-<date>-full.1.dar, .2.dar,
as many as it needs.  It's then up to you to write those to CD/DVD.

Note that mkisofs doesn't yet grok >2G files.  At this writing,
the cdrtools-devel version claims to... but I'm not interested
in verifying that claim :-).  So you can't really do -s 4608M
or whatever the size is for a DVD.  

Lots more info, including very thorough documentation and tutorials,
on the project home page:

    http://dar.linux.free.fr/

G'luck,
^E
-- 
Ed Santiago               Toolsmith               [EMAIL PROTECTED]

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