How to Create a Compressed Automated Backup Script in Linux with Tar and Cron

✨ Quick Answer

The most serious mistake in managing local or home servers is not having automated and intact backups against hardware failures or file corruption. Creating a scheduled task that packages your essential configuration files will guarantee peace of mind.

Quick Diagnostics

Cause

Cronjob failing due to relative paths or environment variables

Solution

Specify absolute paths in script (/bin/tar, /usr/bin/crontab)

Cause

Insufficient write permissions in destination directory

Solution

Ensure write permissions with chmod 755 or run cron as root

The most serious mistake in managing local or home servers is not having automated and intact backups against hardware failures or file corruption. Creating a scheduled task that packages your essential configuration files will guarantee peace of mind.

Step-by-Step Solution

1. 1

   Step 1: Escribir el script de empaquetado en Bash

   Create a script in your user directory that automates the data compression by adding the current date to the name of the resulting file:

   BASH Copy

   # Crear el script de respaldo
   nano ~/auto_backup.sh
   

   Paste the following code into the editor:

   BASH Copy

   #!/bin/bash
   # Definir variables de rutas absolutas
   BACKUP_DIR="/var/backups/my_app"
   SOURCE_DIR="/var/www/html/my_app_data"
   FECHA=$(date +%Y-%m-%d_%H%M%S)
   FILE_NAME="backup_$FECHA.tar.gz"
   
   # Crear directorio de respaldo si no existe
   mkdir -p "$BACKUP_DIR"
   
   # Comprimir la carpeta de origen usando exclusión de temporales si es necesario
   /usr/bin/tar -czf "$BACKUP_DIR/$FILE_NAME" "$SOURCE_DIR"
   
   # Opcional: Eliminar archivos de respaldo más antiguos de 30 días para evitar saturar el disco
   /usr/bin/find "$BACKUP_DIR" -name "backup_*.tar.gz" -mtime +30 -delete
   

2. 2

   Step 2: Otorgar permisos de ejecución al script

   Ensure that the system can invoke the script you just scheduled:

   BASH Copy

   chmod +x ~/auto_backup.sh
   

3. 3

   Step 3: Programar la ejecución en el programador de tareas Cron

   Open your user's task table:

   BASH Copy

   crontab -e
   

   Add the following rule to run the automatic security packaging daily (for example, at 02:00 AM):

   PLAINTEXT Copy

   0 2 * * * /usr/bin/bash /home/usuario/auto_backup.sh >> /home/usuario/auto_backup.log 2>&1