i written command bro to get the backup from database server.

just put the path

mysql -h servername -u dbusername -p databasename < backupname.sql
here like your path is

/home/username/public_html/backup_folder/backupname.sql
than you command will modify like

mysql -h servername -u dbusername -p databasename < /home/username/public_html/backup_folder/backupname.sql