

Depends on what you’re doing a bit. Databases? Hypervisors? Just files? If all of the above, its best to use an actual product this. Either foss like borgbackup or Urbackup, or something like Veeam which is a popular pay option.
If its a proxmox hypervisor, they have their own free backup appliance, but you need a second physical server to run it on.
If it’s just databases, most have a built in way to take a backup. Just google the name and backup. Make sure it’s running automatically and is moved to a separate server on each run.
For files, rsync is a great option.
Just use solar panels to power the ac to cool the water that makes the nuclear. Bonus points for floating solar arrays that cool the panels while shading the cooling water.
Extra bonus: you get to blame perfectly functional renewables when nuclear fails.