Because Docker and containers are horrible places, where nothing works, like crontab and nano 
I know, kind of, what I do when I see /var/discourse but after ./launcher enter app I am totally lost. That’s why my Mastodon-server backups itself, but Discourse not (well, once a day yes, but still).
Yes, I know discourse backup do what I want, it even sends the dump to S3, but I don`t how to time it — because that horrible and terryfying container thingy, that is an OS inside an OS.