John Yao d0734df404 MDL-65729 Backup: Split individual backups into ad-hoc tasks
* refactor run automated backup
* new backup status of Queued
* adhoc task for backing up a course
* course locking for course backup adhoc task
* use Moodle locking instead of custom locking for run automated backup task
* add unit tests to extracted methods
2019-12-04 15:10:23 +11:00
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