use this website :)

how to backup through ssh from data server to backup server
login to server

make sure you're running screen
screen

check whether there is enough room on disk
df -h

MySQL
- database involed

backup
mysqldump --opt -u [uname] -p[pass] [dbname] > [backupfile.sql]
or better solutions when data lock error
mysqldump --single-transaction

tested on: drupal 7, linux mint 17,LAMP
apache install extension
apt install php7.0-gd php7.0-mysql php7.0-common php7.0-xml
copy drupal files to:
cd /var/www/drupal

dont forget to copy .httaccess

- in .htaccess uncoment