There's more than one way to skin a cat. If you're running something as simple and low profile as OP suggested, all you need to backup from the system are the p

There's more than one way to skin a cat. If you're running something as simple and low profile as OP suggested, all you need to backup from the system are the packages you installed and a handful of configurations you changed in /etc. That could be in ansible, but it could be just a .sh file, really. You'll also need a backup of the actual data, not the entire /. Although, even if all you did was backup the entire / there's a good chance it would work even if you try to recover it in new hardware. The services metioned by OP don't need to talk to each other, they are all things that work out of the box by just running apt-get install or equivalent. You don't need anything really fancy and you can set up a new box with part of the services if they are ever taking too much resources (which, for a small setup, will likely never really happen. At least in my experience)