49401ddb9a
We now schedule a periodic check of pending backups; if any apps have requested a backup since the last check, we perform all of the pending backups. The periodic backup scheduling matches the enable/disable state of the backup manager; while backups are disabled entirely there are no periodic wakeups. The period is set here to one hour. If an external caller (transport, the 'bmgr' command line tool, etc) requests an immediate backup pass, that is performed and then the periodic backup check is rescheduled using that pass as the starting point of a new interval.