Configuration > System > Backup and Migrate > Restore database..... Did I just load my database export on the live website? oops
If the stress of pressing the wrong button on a live website is familiar to you, you need the Environment Indicator module! On large Drupal projects you will often be using multiple environments. Local development, online development, test, acceptance and finally 'production'. Environments are easily mixed up as they probably look identical in every way except the url in the address bar.