It's containerized. It's an easy enough problem to solve, if you don't want it complicated.
Here's what I did with my own setup: Stop the containers at night, copy the files to a second system that's configured with the same containers and that can become the primary as needed.
I already monitor my systems for health and backup states, so these would be added to that. But all that does take a few hours to set up.
You want your backups regardless and you want to have some certainty they're working/good. It's a problem that needs to be addressed, even you are going to agree with me on that.
Here's what I did with my own setup: Stop the containers at night, copy the files to a second system that's configured with the same containers and that can become the primary as needed.
I already monitor my systems for health and backup states, so these would be added to that. But all that does take a few hours to set up.
You want your backups regardless and you want to have some certainty they're working/good. It's a problem that needs to be addressed, even you are going to agree with me on that.