How do you back up Plex?

I know Plex does its own backups. And I know the Appdata Backup plugin works as I use it for other containers (and relied on it in the past). But, what happens if I lose the drives appdata is on? And Appdata Backup requires the container to stop, which I don't want to stop Plex. So how do you backup Plex? And specifically get the backups off the cache/array and on to another system? Thanks in advance!