What happens if you keep the backup on a ssd too and that ssd also gets corrupted?
Will this lead to the entire forum getting wiped out?
Backup drives have no need to be quick so they're probably high capacity non SSD drives in a raid 1. And because they're much larger capacity than the active SSD raid array, they can contain multiple, historical backups of the same databases. At least, that's how I'd do it on a budget. Probably some periodical backups moved elsewhere as well.