itramblings

Ramblings from an IT manager and long time developer.

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Pretty good backup script for linux folders

This was originally taken from here with some modifications by me

Automating backups with tar

It is always interesting to automate the tasks of a backup. Automation offers enormous opportunities for using your Linux server to achieve the goals you set. The following example below is our backup script, called backup.cron. This script is designed to run on any computer by changing only the five variables:

  1. COMPUTER
  2. DIRECTORIES
  3. BACKUPDIR
  4. TIMEDIR
  5. BACKUPSET

We suggest that you set this script up and run it at the beginning of the month for the first time, and then run it for a month before making major changes. In our example below we do the backup to a directory on the local server BACKUPDIR, but you could modify this script to do it to a tape on the local server or via an NFS mounted file system.

  1. Create the backup script backup.cron file, touch /etc/cron.daily/backup.cron and add the following lines to this backup file:
    #!/bin/sh
    # full and incremental backup script
    # created 07 February 2000
    # Based on a script by Daniel O'Callaghan <danny@freebsd.org>
    # and modified by Gerhard Mourani <gmourani@videotron.ca>
    # and modified by Shawn Anderson <sanderson@eye-catcher.com> on 2016-08-14
    #Change the 5 variables below to fit your computer/backup
    
    COMPUTER=$(hostname) # name of this computer
    BACKUPSET=HOMEDIR # name of the backup set
    DIRECTORIES="/home" # directories to backup
    BACKUPDIR=/backups # where to store the backups
    TIMEDIR=/backups/last-full # where to store time of full backup
    TAR=/bin/tar # name and location of tar
    
    #You should not have to change anything below here
    PATH=/usr/local/bin:/usr/bin:/bin
    DOW=`date +%a` # Day of the week e.g. Mon
    DOM=`date +%d` # Date of the Month e.g. 27
    DM=`date +%d%b` # Date and Month e.g. 27Sep
    
    #Set various things up
    
    # Is PV installed?
    type pv &gt;/dev/null 2>&1 || sudo apt-get install pv
    
    # Do the required paths exist
    if [ ! -d $BACKUPDIR ]; then
       mkdir $BACKUPDIR
    fi
    
    if [ ! -d $TIMEDIR ]; then
       mkdir $TIMEDIR
    fi
    
    # On the 1st of the month a permanent full backup is made
    # Every Sunday a full backup is made - overwriting last Sundays backup
    # The rest of the time an incremental backup is made. Each incremental
    # backup overwrites last weeks incremental backup of the same name.
    #
    # if NEWER = "", then tar backs up all files in the directories
    # otherwise it backs up files newer than the NEWER date. NEWER
    # gets it date from the file written every Sunday.
    
    # Monthly full backup
    if [ $DOM = "01" ]; then
       NEWER=""
       $TAR $NEWER cf - -C $DIRECTORIES/* | pv -s $(du -sb $DIRECTORIES | awk '{print $1}') | gzip > $BACKUPDIR/$BACKUPSET-$COMPUTER-$DM.tgz
    fi
    
    # Weekly full backup
    if [ $DOW = "Sun" ]; then
       NEWER=""
       NOW=`date +%d-%b`
    
       # Update full backup date
       echo $NOW &gt; $TIMEDIR/$COMPUTER-full-date
       $TAR $NEWER cf - -C $DIRECTORIES/* | pv -s $(du -sb $DIRECTORIES | awk '{print $1}') | gzip > $BACKUPDIR/$BACKUPSET-$COMPUTER-$DOW.tgz
    
    # Make incremental backup - overwrite last weeks
    else
       # Get date of last full backup
       NEWER="--newer `cat $TIMEDIR/$COMPUTER-full-date`"
       $TAR $NEWER cf - -C $DIRECTORIES/* | pv -s $(du -sb $DIRECTORIES | awk '{print $1}') | gzip > $BACKUPDIR/$BACKUPSET-$COMPUTER-$DOW.tgz
    fi
    
    # Remove backup files older than 90 days (this really shouldn't be necessary unless something
    # isn't right with the auto-rotation. I have it in just for good measures
    find $BACKUPDIR/$BACKUPSET-$COMPUTER* -mtime +90 -exec rm {} \;
    Example 33-1. Backup directory of a week
    Here is an abbreviated look of the backup directory after one week:

    total 22217
    -rw-r--r-- 1 root root 10731288 Feb 7 11:24 deep-HOMEDIR-01Feb.<b class="command">tar</b>
    -rw-r--r-- 1 root root 6879 Feb 7 11:24 deep-HOMEDIR-Fri.<b class="command">tar</b>
    -rw-r--r-- 1 root root 2831 Feb 7 11:24 deep-HOMEDIR-Mon.<b class="command">tar</b>
    -rw-r--r-- 1 root root 7924 Feb 7 11:25 deep-HOMEDIR-Sat.<b class="command">tar</b>
    -rw-r--r-- 1 root root 11923013 Feb 7 11:24 deep-HOMEDIR-Sun.<b class="command">tar</b>
    -rw-r--r-- 1 root root 5643 Feb 7 11:25 deep-HOMEDIR-Thu.<b class="command">tar</b>
    -rw-r--r-- 1 root root 3152 Feb 7 11:25 deep-HOMEDIR-Tue.<b class="command">tar</b>
    -rw-r--r-- 1 root root 4567 Feb 7 11:25 deep-HOMEDIR-Wed.<b class="command">tar</b>
    drwxr-xr-x 2 root root 1024 Feb 7 11:20 last-full
    

    Important: The directory where to store the backups BACKUPDIR, and the directory where to store time of full backup TIMEDIR must exist or be created before the use of the backup-script, or you will receive an error message.

  2. If you are not running this backup script from the beginning of the month 01-month-year, the incremental backups will need the time of the Sunday backup to be able to work properly. If you start in the middle of the week, you will need to create the time file in the TIMEDIR. To create the time file in the TIMEDIR directory, use the following command:
    [root@deep] /# date +%d%b < /backups/last-full/myserver-full-date

    Where /backups/last-full is our variable TIMEDIR wherein we want to store the time of the full backup, and myserver-full-date is the name of our server e.g. deep, and our time file consists of a single line with the present date i.e. 15-Feb.

  3. Make this script executable and change its default permissions to be writable only by the super-user root 755.
    [root@deep] /# chmod 755 /etc/cron.daily/backup.cron

Because this script is in the /etc/cron.daily directory, it will be automatically run as a cron job at one o’clock in the morning every day.