BB complements TM for me; it's super useful to have a local versioned backup that's updated every time I dock my laptop with the desk, and is also invisibly supplemented by a versioned backup of changes I've made that the OS maintains on unused space on the laptop's drive. Works even if I'm sitting at a cafe with all the radios turned off to get maximum life out of the battery.

Backblaze? Backblaze is there for in case my house burns down and I leave with nothing but the clothes on my back.