How to Backup Files and Directories in Linux Automatically

This article helps you automatically back up files and directories in Linux.

The example can be for any files or directories located on your server and with the correct user privileges.

Archive the content with commands

Use tar to back up your files. It is straightforward. Just use the following command:

# tar -cvpzf /backup/backupfilename.tar.gz /data/directory

My example for backing up the HTML folder

# tar -cvpzf /backup/myexample.com.tar.gz /var/www/html

It is essential to make sure that the destination folder exists, if not, create it using the following command:

# mkdir /backup

Explanation of tar command

• tar = Tape archive
• c = Create
• v = this lists all archived files.
• p = used to preserve files and directory permissions.
• z = this tells tar to compress / zip files.
• f = this allows tar to get the file name. 

How to backup files with a shell script

To do this, add the tar command in a bash script to make this process automatic. It is also advisable to add a dynamic value in the name to prevent overwriting of backup files.

Create a file using an editor, i.e. vi backup.sh and paste the script below

# vi /backup.sh

Paste the following script and change your details.

Note: The v parameter for the tar command was not necessary here. 

Automation

In Linux, Cron jobs can be used for task scheduling as they are easy to use.

Example

Showing a cron job line with 6 parts:

To open crontab editor utility, run:

# crontab -e

Note: You can observe that the edit rules are similar to those of the vi editor.

Example One

An example to run a script every day at 03:00:00 type this in the editor.

# M H DOM M DOW CMND

00 03 * * * /bin/bash /backup.sh

Example Two

To run the same script twice a week on Tuesday and Friday, type the following command in the editor:

# M H DOM M DOW CMND

00 03 * * 2,5 /bin/bash /backup.sh

Note: You can sometimes run out of disk memory if the source folder is too big.