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Customizing Drupal Theme- CSS in detail - ThemesWiki
General backup best practices Always back up the entire site before updating or upgrading. (It is also a good idea before migrating, copying, moving, or replacing.)Date your backups. Save each one into a directory or file with a title that includes the date of the backup. You do not want to be guessing which backup is the most recent one when you are trying to recover your failed site. Back up your Drupal site Back up your Drupal site
Database backup | Acquia