Tubus Rack Compatibility on a 29er With Discs
I have a salsa Fargo, with the tubus duo and logo racks. The cargo appears to be a more basic logo, so you should be fine for the rear.

The fargo's caliper mounts are inside the rear triangle, and the bike is designed to be a touring bike.

With the duo, you will sacrifice using the fork mounted bottle cage mounts. Its most likely the same for the Tara. That upper loop on the Tara may interfere with a 29er, but I have no first hand experience.