This files describes API changes in /backup/*,
information provided here is intended especially for developers.

=== 10 ===

* New close() method added to loggers so they can close any open resource. Previously
  any backup and restore operation using the file logger may be leaving unclosed files.
* New destroy() method added to loggers, normally called from backup and restore controllers
  own destroy() method to ensure that all references in the chained loggers are deleted
  and any open resource within them is closed properly.
* abstract class backup_tool_plugin has been added. This class can be extended to support admin tools
  in course and module backups.
* abstract class restore_tool_plugin has been added. This class can be extended to support admin tools
  in course and module backups.
