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What is the best procedure for reverting the CiviCRM, powered by Drupal 7, back to a previous backed up state, in case of database corruption, failed upgrades or other undesirable changes?

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How to revert the CiviCRM to previous state:

  1. Put Drupal into maintenance mode
  2. Disable integration modules
  3. Replace civicrm.settings.php with backed up copy and check permissions
  4. Remove everything in <drupal_home>/sites/all/modules/civicrm and replace with backed up version and check permissions
  5. Drop civicrm database and import backup database

  6. Clear caches and empty <drupal_home>sites/default/files/civicrm/templates_c and check permissions

  7. Re-enable integration modules

  8. Log in, test and debug

Command Line Cheatsheet for Drush and MySQL, Regarding These Steps:

Maintenance mode: drush vset maintenance_mode 1

Disabling and Enabling CiviCRM Integration Modules:

drush pm-disable [integration_module] or drush pm-enable [integration_module]

Dropping, re-creating and importing a database in MySQL:

mysql -u [username] -p
use [database name];
DROP DATABASE [database];
CREATE DATABASE [database];
source path/to/backup.sql;

Clear caches: drush cc all

Dealing with templates_c: rm <drupal_home>sites/default/files/civicrm/templates_c/*

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