The host has 90d uptime and the docker container has 6 weeks of uptime, so no actual reboots, unless you’re talking about something inside the application.
No manual backups from me, certainly not one every single day. Nothing in cron etc either.
root@forum:/# uptime
17:20:56 up 90 days, 1:52, 4 users, load average: 0.81, 1.71, 1.81
root@forum:/# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
d8bc34250454 local_discourse/app "/sbin/boot" 6 weeks ago Up 6 weeks 0.0.0.0:80->80/tcp, :::80->80/tcp, 0.0.0.0:443->443/tcp, :::443->443/tcp app