Also you know it's also possible to setup backups on the drive connect, also a good thing to turn off the networking beforehead 😶‍🌫️ (Also it's possible to do "timer usb hub", it's not very off-site, but a switch can turn on every X days and the machine will mount it and do the backup, then the usb hub turns off (imagine putting it in a fireproof safe with a small hole for a usb cable))

Also, i'm using ntfy.sh for notifications And if you're using raid, you can setup it with on a drive failure