#incremental #backup using #tar #sh

backup.sh

#!/bin/sh

# by Jakukyo Friel <weakish@gmail.com> under GPL-2 

### Incremental backup using tar

## Usage:

# backup /path/to/dir/

# Backup files will be put in the current directory.
# Suppose foo is the basename of the backing up directory,
# backup files will be named as:
# - foo.txz (full backup, we use xz compression)
# - foo.YY-MM-DD.txz (incremental level-1 backup)
# - foo.snar (incremental list file)

base_name=`basename $*`
level0=$base_name.txz
level1=$base_name.`date +%F`.txz
incremental_list=$base_name.snar
original_incremental_list=$incremental_list.orig

if [ -e $original_incremental_list ]; then
  cp $original_incremental_list $incremental_list
  tar -cJf $level1 -g $incremental_list $*
else
  tar -cJf $level0 -g $incremental_list $*
  cp $incremental_list $original_incremental_list
fi