3 calls to _update_manager_check_backends()

update_manager_install_form in modules/update/update.manager.inc: Form constructor for the install form of the Update Manager module.
update_manager_update_form in modules/update/update.manager.inc: Form constructor for the update form of the Update Manager module.
update_manager_update_ready_form in modules/update/update.manager.inc: Form constructor for the update ready form.

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