The server is using a RAID-1 software mirror.
Strike 1! lol Software mirrors, generally speaking, are ---steaming pile of meadow muffin---.
Please make sure you have off-site backups!
Well offsite backups are more for like a building burning down or some other sort of catastrophic event; if Saint's crib went kaput I don't think restoring BYOAC would be very high on the priority list. It's not bad advice though! At minimum he should be dumping backups to an external drive. Its an arcade forum, not medical records
Where I work, I have the VMs replicating between hosts for fail over and redundancy. Hosts are on RAID 10 (mirror of stripes), and that data is backed up to a Unitrends appliance with its own RAID10 array. Unitrends does incremental daily back ups, with synthetic fulls at the end of the week, with natural full back up once a month. That data is mirrored to the cloud nightly after CRC checks. Test restores are performed monthly as well. In the unlikely event all of our physical hosts fail we can spin up VMs on the unitrends box. If that also somehow magically died too, we can spin up VMs in the cloud.
I wrote out the entire DR plan and it was a giant pain in the butt and hopefully we never have to use it. I'm pretty savvy with backups, but my focus is still cyber security.