OK, this is a bit off-topic, but when I thought backup and looked at all these tools, what I really wanted was a way to have all my files being synced and that I could change stuff on pc1 change stuff on pc 2 and pc 3 and have it all merged unto all the computers.
So after many years of testing out different backup-solutions, I tried Unison in a star-topology (all machines sync to a central machine), and it works fantastic. You get version-backup of the files as well, something that was rather nice now that my Lucid Lynx computer crashed because of the Intel GPU-bug and destroyed my full HomeBank file.
Of course, you could also run something like rdiff-backup on top of your server-tree of files in order to backup other places. But in these «I've got many computers, many of which is mobile and need to work on all of them» days, Unison is a real treat.