Ask HN: What is your tool of choice to back up data on your GNU/Linux box?
It could be a server or desktop. There are many excellent options out there, but I wanted to her some opinions on what makes it your program of choice.
Then I mount and dismount USB hard drives at various locations on the network, swapping them in and out regularly. Every drive has a reasonably recent copy, thus getting redundancy with very little effort.
It was easy to set up, it's easy to run, it has significant redundancy, and every (*nix) machine is backed up.