I know there's plenty of backing up/synchronizing software for Mac. I know Time Machine is awesome. But none of the software I tried was able to do it my way :). Thus, as I have a Linux/FreeBSD background, I wanted to do it my way and the command line solution seamed to be a good one.
My office Windows machine has plenty of disk space and is rarely used. It was an ideal system (with not so ideal file system) to do backups on.