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Don't forget to check Backup&Migrate settings after D6 to D7 upgrade!

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Several days ago we upgraded simple Drupal 6 site to Drupal 7. After core upgrade process was finished we turned on all necessary modules such as Admin menu and Backup & Migrate. Some features required custom update by scripts and some manual work, we made backup before this activity. ... something went wrong and we go back by restoring DB via Backup&Migrate module and site wend down :-( When we took a look on DB backup script we found that there was empty dump with the structure of some tables. So as a result the data in several tables was killed. When we repeated upgrade process again and took a look on Backup&Migrate advanced settings we were shocked incorrect table exclude settings By some reason all tables was excluded from backup. After we align B&M settings backup became works correctly :-) The main idea of this post due to automatic upgrade process you should double check settings of contributed modules, upgrade can make them different according initial state. And, of course, backups is necessary part of site development activity but you should be sure that your backups correct.

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