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 Keeping a record of backup disks
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There are some extra programs to log discs burned.

The way I use this feature is as follows:

  I make a back CD or DVD in the normal way, with all of the tarballs for
  example in the directory /tmp/backup.  I first create a disc list in the
  system as follows:

     cd /tmp/backup
     disc-import *

  At this point it will ask for a label, which must be 12 characters.  I use
  the date and three digits sequential number for the label such as:

     20070413-001

  It will then record the file name, file size, and MD5, SHA1, SHA256, and
  SHA512 sums of all the files.  My logic is that even if all of those are
  compromised in the future having all of them is still pretty safe because I
  can't imagine that it would be possible for one cracked file to still match
  all 4 of them at the same time.

  Then after I burn a disk I mount it and do the following:

     cd /mount/cdrom0
     disc-log *

  It will read all the files from the disc and if it matches the disc list
  created above, it will ask which copy of the disk it is, and then where
  it is stored.

  You can see what discs you have stored with the following command:

     disc-list

  And if you want to see what files are on the discs:

     disc-list --contents

  NOTES:

    * As of release Alpha_28.4 it can deal with subdirectories on the disc.
      In prior versions all of the files had to be in the root directory of the
      disc.

    * Currently, the system cannot store information about empty directories or
      files.  In version Alpha_29, two options (--ignore-empty-directories
      and --ignore-empty-files) were added to allow the disc-import and disc-log
      to allow a disc with empty files and/or empty directories to be logged.


