behat test "backup_and_restore.feature" throws error

[rezeau]

Scenario: Backup and restore a course containing an OU multiple response question
And I backup "Course 1" course using this options: # behat_backup::i_backup_course_using_this_options()
| Confirmation | Filename | test_backup.mbz |
Button matching locator "Continue" not found. (Behat\Mink\Exception\ElementNotFoundException)
To fix: add this line in the test at the end of Background:
And the following config values are set as admin:
| enableasyncbackup | 0 |