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@rudra ... I followed a tutorial to install REAR and store the created ISO image on a server via NFS.

I can't outline the commands better myself, this tutorial does it all. https://www.linuxtechi.com/install-rear-...-7-rhel-7/ In fact all other tutorials outline how to create the ISO and store it on a USB, this is probably the only one which outlines use of NFS to create the backup and remotely store it. I've a shared SSH account on a server with a hell lot of storage from my friend, which ofc I use for storing bulky stuff and that's where this ISO image is stored too.

In case of a hardware or an SSH failure, all you have to do is boot from the custom ISO image that you will have. There will be a option for "REAR recovery" as the tutorial outlines, and you need to go for a automatic or manual backup depending whether you have the exactly same system configuration, or something different. I'd always go for the manual one, in case there's a need to. In our case, you just hand over this ISO image to the Admins here and they will do the rest.

Hope that helps!