Making sure the "files" tree is included in the backup

In cases where the file upload method is set to "private" (i.e., handled by Drupal), the "files" directory can be relocated outside the Drupal main directory. In fact, it's often a good idea to put this outside the http documents directory, to control access.

If the files directory has been relocated outside the Drupal main directory, it's not included in the backup.

It'd be useful for backup to check the path to the "files" directory, and make sure its contents are included in the backup. Perhaps by putting it in its own zip file, as is done for databases.