I ran the logs command with no errors. I opened the cms-db-backup file, the code seemed normal, I verified that the password was correct. I ran the backup manually, it worked with no errors (it also worked when the file existed).
The ps aux | grep cron produced the following
root ___52 0.0 0.0 23656 _500 ? Ss Apr07 0:46 /usr/sbin/cron
root 30330 0.0 0.0 12788 1904 ? S+ 08:30 0:00 crontab -e
root 30331 0.0 0.0 _4448 _684 ? S+ 08:30 0:00 /bin/sh -c /usr/bin/sensible-editor /tmp/crontab.Bff1ns/crontab
root 30332 0.0 0.0 _4448 1644 ? S+ 08:30 0:00 /bin/sh /usr/bin/sensible-editor /tmp/crontab.Bff1nS/crontab
root 30345 0.0 0.1 26680 3100 ? S+ 08:30 0:00 editor /tmp/crontab.Bff1nS/crontab
root 30494 0.0 0.0 _8868 _764 ? S+ 08:52 0:00 grep --color=auto cron
the cat /var/spool/anacron/cron.daily produced 20170407 which is the date I initially ran the docker-compose up.
Any ideas?