title: Big Database backup best practice
body: <p>I maintain big MySQL database. I need to backup it every night, but the DB is active all the time. There are queries from users.
  Now I just disable the website and then do a backup, but this is very bad as the service is disabled and users don't like this.</p>
  
  <p>What is a good way to backup the data if data is changed during the backup?</p>
  
  <p>What is best practice for this?</p>