anchor.diff:  
   TODO
   
  +
   == Script Format
   
   PreBackup script is a Plain Old Shell Script (actually a Bash script to be precise) with few simple conventions (just like OpenRC runscripts, ebuilds etc.)
   
  +You should use https://en.wikipedia.org/wiki/Shebang_%28Unix%29[shebang] with path of the master link:bin/prebackup[prebackup] script.
  +Then you must define functions `pre-backup`, `post-backup` and optionally `setup`.
  +
  +setup()::
  +  If defined, then this function is executed before each `pre-backup()` and `post-backup()`, in the same environment.
  +  You may use it to check if required variables are set (using `required-var()`), to define some common variables or anything else that should be run before `pre-backup()` and `post-backup()`.
  +
  +pre-backup()::
  +  This function is executed when you run the script as a file named `pre-backup` (e.g. using symlink) or with argument `-c pre-backup`.
  +  As the name suggests, it should be run _before_ actual backup, e.g. to dump database, create filesystem snapshot, …
  +
  +post-backup()::
  +  This function is executed when you run the script as a file named `post-backup` (e.g. using symlink) or with argument `-c post-backup`.
  +  It should be run _after_ actual backup, e.g. to clean database dumps, destroy filesystem snapshot, …
  +
   [source, sh]
  +.Prebackup Script Template
   ----
   #!/usr/local/bin/prebackup
   # vim: set ft=sh ts=4:
  
positive.code: 
  == Configuration
  
  TODO
  
  
  == Predefined Variables
  
negative.code:   * $1: variable name
  
  
  == Recommended Directory Structure
  
  ----
  /
  