Everybody knows the criticality of backup. You might have had your database dumped, data directory copied, flat files exported and even config and binary log files backed-up. But did you backup your MySQL user privileges?
One can easily forget to backup the user privileges but it is much easier to do and you should backup your MySQL server user privileges / grants regularly.
1. Backup MySQL user privileges using mysqldump:
$] mysqldump -uUSER -pPASS --databases mysql > mysql.sql