Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

After hearing about various high profile website creators getting stiffed recently after hardware failures on their servers I would like to implement a backup strategy on my websites.

I have cPanel available to me but there is no facilty for me to schedule backups and have them emailed to me. There is the facility to "crontab" but I am not an experienced Unix user so don't know how to use that.

What I would like to be able to do is create a backup of my entire home directory, compressing it at the same time and then sending an email notifying me such a backup has been done and I can download and archive.

Please can somebody provide me with any pointers on how I would do such a thing?

Cheers, Ian.

share|improve this question
    
The best solution may be to use the 'crontab' facility. It's worth learning about. –  pavium Dec 14 '09 at 13:02

1 Answer 1

up vote 2 down vote accepted

To start you off the commands you want to learn how to use; tar, mail and basic shell scripting.

The Shell Script

A really quick and dirty example of how to do this would be the following:

#! /bin/sh

# The following command creates a GZIP'd version of your folder. -c = create
# -z = use gzip, -f = file name of backup file
# You can use j instead of z to use bzip2. It's slightly slower but compresses
# more. Beware that images, videos and such do not compress well.
cd /PATH/NOT/IN/HOME/FOLDER; tar czf backup.tgz /PATH/TO/HOME/FOLDER

# If you only have access to your home folder you can modify the command to
# look like so, regular expressions are your friend here.
tar czf backup.tgz FOLDER1 FOLDER2 FILE3

# The mail program may be disabled and uses the local SMTP server so depending
# on your mail setup it may never even get to your inbox because it is flagged
# as unverified mail (Spam). For example, Gmail or a domain not hosted on that
# same server will almost most certainly not work. If this fails to work you
# can create a PHP or Python script that actually allows you to set the SMTP
# server. An alternative is to have this script echo some output and have cron
# send the output to you instead. It's dependent on your setup.
# -s Subject
# 
mail -s "Backup Done!" "youremailaddress@wherever.com"

Set the script to executable (chmod 755 nameOfScript.sh) and make note of where you've saved it on your

Getting Crontab to run the Shell Script

To set up your crontab from the command line enter crontab -e to edit your crontab file. The layout of the file is as below:

*     *   *   *    *  command to be executed
-     -    -    -    -
|     |     |     |     |
|     |     |     |     +----- day of week (0 - 6) (Sunday=0)
|     |     |     +------- month (1 - 12)
|     |     +--------- day of month (1 - 31)
|     +----------- hour (0 - 23)
+------------- min (0 - 59)

Source of Diagram: Admin's Choice

In this case, adding a line such as:

33  0 * * *    /PATH/TO/HOME/FOLDER/nameOfScript.sh

will run the script every day at 0:33 / 12:33 AM.

If you want to find out more check out the man pages for tar, mail and crontab. They're indispensable when dealing with UNIX administration in any form. With uuencode you could even email the whole site to yourself if it was small enough.

share|improve this answer
    
Excellent answer thank you very much. –  Ian Dec 15 '09 at 12:20

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.