Windows Backup
After installing Windows 7 in place of OS X on my MacBook Pro for work, there are only a few things I miss. But man, they were really nice.
Unix shell Time Machine The first one I’ll just say if you haven’t used a Unix-like shell of some type (Bash, zsh, whatever) then it’s hard to explain. Just that you can do everything a GUI can do (save for graphics work), but much, much faster.