steps to perform mysql databases backup:

• put the server  in a read-only state:
  FLUSH TABLES WITH READ LOCK;
SET GLOBAL read_only = ON;
• backup data via this script or:
  mysqldump -h host_name --user=user_name --password=password --events --opt --single-transaction db_for_backup | gzip > backup_name.gz
• turn off read-only mode:
  SET GLOBAL read_only = OFF;
UNLOCK TABLES;

to restore db from backup:

• you can use this script
• or:  mysql -u user "db_name" < backup_name
• or: gunzip < backup_name.gz | mysql -u user -p password db_name