I just reset settings and turned on logging.
After entering my keys and choosing the correct bucket, I set weekly backups again and prompted for an ASAP backup.
I’m stilling seeing the alert that my ad-hoc backup is scheduled for 11:31 am, but the log says this:
[2015/03/04 12:54:57] Scheduled weekly backup. Next backup: 7:00 pm
[2015/03/04 12:55:03] Scheduled ASAP backup in 60 seconds.
Nothing after the 12:55:03 log, though 2+ minutes have passed.