(tar)Backups and Restoration

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Performing Backups and Restoring Files
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     .* dumps
     . + what are dumps
     
     . + different levels of dumps
     .  - full dump = dump everything
     .  - level 1, level 2 dumps etc, -
     	A level n dump dumps everything changed since the last level
     	n-1 dump (?)
     
     . + how to use scripts for dumps  (ie, the concept)
     .  - scripts to run after editing backup specs (details)
     
     . + Backup Specs, what is it.
     .  - how to customize
     .  - actual text of script  [/sp/dump/backup-specs]
     
     . + Problems
     .  - rsh doesn't work
     .  - rtape isn't installed
     .  - (others?)
     
     . + the --incremental option of tar
     
     . + tapes
     .  - write protection
     .  - types of media
     .   : different sizes and types, useful for different things
     .  - files and tape marks
          one tape mark between files, two at end.
     .  - positioning the tape
          MT writes two at end of write, backspaces over one when writing again.

   To "back up" a file system means to create archives that contain all
the files in that file system.  Those archives can then be used to
restore any or all of those files (for instance if a disk crashes or a
file is accidently deleted).  File system "backups" are also called
"dumps".

Full Dumps

Inc Dumps

incremental and listed-incremental

Backup Levels

Backup Parameters

Scripted Backups

Scripted Restoration