SETUP and CONFIGURATION from WebGUI (except LVM), DATA for ACLs ( but not the data/information) as your data will be saved on the storage.

And when having this saved settings it will help you to bring your dead server back as fast as possible.

But to let you know if you’re dead server get some new hardware, then in this case you will need to get a new activation for your license key, it is a way to protect customer license key from being used on another computers than the one they register.