Here is a good script for backing up all mysql database on a Plesk server. Add a cron entry so that it runs everyday. Change the ‘-mtime +7’ value to determine how many days of backups you will keep.

vi /usr/local/sbin/sqldumpscript
chmod 755 /usr/local/sbin/sqldumpscript


#! /bin/bash

TIMESTAMP=$(date +"%F")
BACKUP_DIR="/var/www/vhosts/mysqldumps/$TIMESTAMP"
MYSQL=/usr/bin/mysql
MYSQLDUMP=/usr/bin/mysqldump
find /var/www/vhosts/mysqldumps/ -maxdepth 1 -type d -mtime +7 -exec rm -rf {} \;

mkdir -p "$BACKUP_DIR"

databases=`$MYSQL -uadmin -p\`cat /etc/psa/.psa.shadow\` -e "SHOW DATABASES;" | grep -Ev "(Database|information_schema)"`

for db in $databases; do
$MYSQLDUMP --force --opt --skip-events --skip-lock-tables -uadmin -p`cat /etc/psa/.psa.shadow` --databases $db | gzip > "$BACKUP_DIR/$db.gz"
done


create crontab entry
39 3 * * * /usr/local/sbin/sqldumpscript