Backup scripts

Wikimedia

First add the following line to LocalSetings.php

$wgReadOnly = 'Dumping Database, Access will be restored shortly';

Delete this line after the backup.
The script should be in the MediaWiki installation (where your LocalSettings.php is stored as well).

backup.sh

#!/bin/bash
FNAME=TS=RHSWiki`date +%d-%m-%Y`
mysqldump --database DATABASE_NAME -u USERNAME -pPASSWORD --add-drop-table -B > ${FNAME}.sql
zip -r ./backup/${FNAME}.zip images/ ${FNAME}.sql LocalSettings.php extensions/
rm ${FNAME}.sql

Bonus (not required):

# careful here .. if this fails you'll delete files from the current directory instead.
# Some checking might be in order, especially if you run this script from somewhere else
cd backup
 
#Count files in directory (hidden files (filename starts with a dot) are ignored) 
file_count=`ls | wc -l` 
 
#Do until there are more than or equal 6 files present
while [ $file_count -ge 6 ]
do
        #you can save deleted filenames in variable (e.g. for deleting files also in backup directory)
        #not recommended for filenames with space(s)
        del_files="${del_files} `ls | head -n 1`"
	#Delete alphabetically oldest file (ls sort by name is default)
	rm `ls | head -n 1` 
	#Count files again
	file_count=`ls | wc -l`
done

Source