scdbackup
- Examples -

• A sample configuration with both a CD and a DVD writer
  
• Optional superuser activities
  
• Backup run with scdbackup_home
  
• Resuming an interrupted backup run
  
• Verifying a result CD
  
• Searching and restoring a particular file or directory
  
• Erasing backup media with confidential data
  
• Incremental backups
  
• Locating files in a multilevel backup and restoring them
  
• Full restore of a multilevel backup
  
• CD mount options
  

Now the parameters get written to their files.
In future runs of CONFIGURE_DVD you may confirm your settings by empty input lines and only have to enter those values which you want to change. The content of those files may be temporarily overriden by shell variables.
See README Appendix CONFIGURATION for a definition of the files' content (if it isn't obvious by name and sequence :)

writing file scdbackup_use_genisoimage_value

done

scdbackup for DVD 0.9.2 : First stage of installation done.

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The commands of your scdbackup installation are now available in :

   /home/thomas/scdbackup/scdbackup-0.9.2/cmd

 

You may want to add this address to your PATH variable

or ask your superuser to run ./SUPERUSER_CONFIGURE in directory

/home/thomas/scdbackup/scdbackup-0.9.2/inst

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  Monday  :  -conf_dir $HOME/home_backup -level -next
  ...
  Saturday:  -conf_dir $HOME/home_backup -level -next
  Sunday  :  -conf_dir $HOME/home_backup -level 0

  Week  1 :  -level 1
  Week  2 :  -level 2
  Week  3 :  -level 2
  Week  4 :  -level 2
  Week  5 :  -level 1
  Week  6 :  -level 2
  Week  7 :  -level 2
  Week  8 :  -level 2
  Week  9 :  -level 1
  Week 10 :  -level 2
  Week 11 :  -level 2
  Week 12 :  -level 2
  Week 13 :  -level 0

• If you cannot afford the disk space and additional computation time for the recording of the backup area state, then you may disable this feature by using option -disable_safe_leveling together with -level -create_configuration.
  But be aware that file movements and deletions cannot be detected that way and will therefore not be included in the higher backup levels. Such a backup is still a good source for recovering from limited data accidents but it may be unable to accurately reconstruct the most recent state of your backup area.
  
• Because of the restricted number of fileaddresses possible with older versions of mkisof there may be whole directories included in the backup despite they contain some older files.
  Therefore, ./CONFIGURE_* advises you to use locally installed cdrtools if their mkisofs mentions "-path-list" in its help text. If you agree, you will get a very high -max_items limit and should have no problem with above issue.
• If quick and simple restore is essential, then you should refrain from incremental backups as long as this does not prevent you from making backups in a sufficient frequency. Consider to purchase a fast DVD recorder or to divide your data into a small frequent and a larger unfrequent backup (take care that both backups do not share any data content).

• Get a start directory outside your $HOME :
  This example assumes a $HOME entirely on the same filesystem as its parent and enough room on that filesystem to take the whole backup. So we will rebuild $HOME below "$HOME"_RESTORED and later move it to its destination. Have your superuser prepare a directory for you

  $ TARGET_ROOT="$HOME"_RESTORED

  $ echo "Dear superuser, please make me directory $TARGET_ROOT"

  Your superuser then is so kind to mkdir the desired directory and to chown it for you. So you now can begin to create own files.

  $ TARGET="$TARGET_ROOT"/$(basename "$HOME")

  $ mkdir "$TARGET"

  $ export SCDBACKUP_RESTORE_ROOT="$TARGET"

  Variable SCDBACKUP_RESTORE_ROOT is needed for the vanish scripts of levels above 0.
  
  
• Level 0:
  Copy level 0 to your disk. With a CD set from the above example that would be for each CD :

  $ mount /cdrom

  $ cp -a /cdrom/* "$TARGET"

  $ umount /cdrom

  It is necessary to make all directories fully accessible because there may be the need to create or delete files during restore of the next level. We will restore the original directory permissions at the end of this example.

  $ find "$TARGET" -type d -exec chmod 0755 '{}' ';'

  In cases of extreme self denial of access rights you may have to do this after each single CD. Watch out for complaints of the cp command.
  
  
• Level 1:
  Execute the vanish script of level 1. This has to be done before copying the backup content in case file objects have changed their types between level 0 and level 1. Such files might be impossible to overwrite by the copy command and thus have to be removed by the script.
  Insert the last CD of level 1 and execute :

  $ mount /cdrom

  $ export SCDBACKUP_RESTORE_PREP_LEVEL=1

  $ gunzip </cdrom/added_by_scdbackup/VANISHED.sh.gz | /bin/sh

  $ umount /cdrom

  Variable SCDBACKUP_RESTORE_PREP_LEVEL set to the current level number prevents an eventual abort which occurs if the vanish script really has to handle file object type changes.
  This is done to avoid unnoticed faulty removals which would occur if the script is run according to the outdated restore procedure which was prescribed in the examples of scdbackup previous to 0.8.5.
  Now copy level 1 to your disk. For each CD :

  $ mount /cdrom

  $ cp -a /cdrom/* "$TARGET"

  $ umount /cdrom

  Again set directory permissions

  $ find "$TARGET" -type d -exec chmod 0755 '{}' ';'

  
  
• Further levels:
  Repeat the steps of level 1 for any higher level you got. (Set variable SCDBACKUP_RESTORE_PREP_LEVEL to the according number.)
  
  
• Finally:
  Restore the directory permissions as they were when the last level was recorded.

  $ gunzip <"$TARGET"/added_by_scdbackup/DIR_PERMS.sh.gz | /bin/sh

  Clean up and have your superuser do the move for you. The existing $HOME is to be moved to a new name and then replaced by the newly built tree. Finally the start directory gets removed.

  $ rm "$TARGET"/added_by_scdbackup/*

  $ rmdir "$TARGET"/added_by_scdbackup

  $ echo "Dear superuser, please do for me :"

  $ echo " mv $HOME ${HOME}_REPLACED"

  $ echo " mv $TARGET $HOME"

  $ echo " rmdir $TARGET_ROOT"

  Dear superuser, be aware of the ill effects if $HOME contains blanks or other characters meaningful to the shell. If you allowed this, now is the time to call yourself names.